# Sprint 11-13: 2. Obergeschoss — Implementation Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** Three fully interactive second-floor rooms (Ultrasound with continuous heartbeat animation, Delivery Room with mama-arrives animation, Nursery with rocking cradles) wired into Main.tscn.

**Architecture:** Floor 2 follows the same side-by-side layout — three rooms at X offsets 0, 1280, 2560 within the `Floor2` node (Floor 2 has only 3 rooms, unlike Floors 0 and 1 which have 4). Two new animated components are introduced: `UltrasoundMachine` (continuous looping heartbeat tween) and `DeliveryBed` (4-state FSM: mama slides in, baby fades in, tap again to reset). `Cradle` adds a rocking rotation animation on tap. `Main.tscn` is updated to replace the Floor 2 placeholder nodes with the real rooms.

**Tech Stack:** Godot 4.6.2, GDScript (static typing), existing `InteractiveObject` base class, placeholder ColorRect graphics.

---

## File Map

| Action | File | Responsibility |
|--------|------|----------------|
| Create | `scripts/objects/ultrasound_machine.gd` | Continuous heartbeat pulse animation (looping tween, no tap required) |
| Create | `scenes/objects/UltrasoundMachine.tscn` | Machine body + screen + pulsing HeartbeatDot Node2D |
| Create | `scripts/objects/delivery_bed.gd` | 4-state FSM: IDLE → MAMA_ARRIVING → COMPLETE → RESETTING |
| Create | `scenes/objects/DeliveryBed.tscn` | Bed frame + Mama Node2D (slides in) + Baby Node2D (fades in) |
| Create | `scripts/objects/cradle.gd` | Rocking rotation animation on tap (2-state FSM) |
| Create | `scenes/objects/Cradle.tscn` | Hanging cradle with suspension ropes and basket |
| Create | `scenes/rooms/floor2/Ultrasound.tscn` | Exam table, UltrasoundMachine, 2 interactive objects |
| Create | `scenes/rooms/floor2/DeliveryRoom.tscn` | DeliveryBed component, 2 interactive objects |
| Create | `scenes/rooms/floor2/Nursery.tscn` | Rail + 3 Cradle instances, 2 interactive objects |
| Modify | `scenes/main/Main.tscn` | Replace Floor2 placeholder with 3 rooms + nav arrows; fix elevator position |

**Room layout in Floor2 (local X positions):**
- Ultrasound: x=0 (room index 0) — camera center world (640, -1080)
- DeliveryRoom: x=1280 (room index 1) — camera center world (1920, -1080)
- Nursery: x=2560 (room index 2) — camera center world (3200, -1080)
- *(No room 3 — Floor 2 has only 3 rooms)*

**Floor2 elevator (top floor — no up button):**
- ElevatorDown2: position (1100, 540) → target_floor = 1

**NavigationArrows in Floor2 (4 total for 2 boundaries):**

| Node | X | Y | target_floor | target_room | label |
|------|---|---|---|---|---|
| NavRight0to1_F2 | 1200 | 480 | 2 | 1 | → |
| NavLeft1to0_F2 | 1340 | 480 | 2 | 0 | ← |
| NavRight1to2_F2 | 2480 | 480 | 2 | 2 | → |
| NavLeft2to1_F2 | 2600 | 480 | 2 | 1 | ← |

**UltrasoundMachine visual layout (local space, origin = machine base center):**
- MachineBody: grey ColorRect 80×160 at (-40, -160) — tall standing machine
- ScreenFrame: dark ColorRect 68×52 at (-34, -152) — 4px border around screen
- Screen: very dark ColorRect 60×44 at (-30, -148) — display area
- HeartbeatDot: Node2D at (0, -126) — center of Screen; scales up/down for pulse
- HeartbeatShape: bright green ColorRect 12×12 at (-6, -6) child of HeartbeatDot
- Probe: grey ColorRect 14×80 at (-7, -30) — ultrasound probe below arm

**DeliveryBed visual layout (local space, origin = center of bed frame):**
- BedFrame: ColorRect 260×50 at (-130, -50) — bed surface
- BedPillow: ColorRect 80×50 at (-130, -100) — head of bed
- BedLeg1: ColorRect 14×120 at (-120, 0)
- BedLeg2: ColorRect 14×120 at (106, 0)
- Mama: Node2D starts at (-600, 0), parks at (-100, 0)
  - MamaBody: ColorRect 60×100 at (-30, -100) child of Mama
  - MamaHead: ColorRect 50×50 at (-25, -150) child of Mama
- Baby: Node2D at (0, -80), starts invisible (modulate.a = 0.0)
  - BabyBody: ColorRect 40×30 at (-20, -15) child of Baby

**Cradle visual layout (local space, origin = top attachment point, pivot for rocking):**
- SuspensionLeft: ColorRect 4×50 at (-25, 0) — rope going down-left
- SuspensionRight: ColorRect 4×50 at (21, 0) — rope going down-right
- CradleBasket: ColorRect 70×40 at (-35, 50) — cradle body
- CradleRim: ColorRect 70×8 at (-35, 46) — top rim of basket
- BabyBlanket: ColorRect 58×22 at (-29, 56) — blanket inside basket

---

## Task 1: UltrasoundMachine component

**Files:**
- Create: `scripts/objects/ultrasound_machine.gd`
- Create: `scenes/objects/UltrasoundMachine.tscn`

The heartbeat runs automatically on scene load — no tap required. The HeartbeatDot Node2D scales up then back down on a looping tween.

- [ ] **Step 1: Create ultrasound_machine.gd**

```gdscript
## UltrasoundMachine — displays a continuous heartbeat pulse on the screen.
class_name UltrasoundMachine extends Node2D

const BEAT_RISE_DURATION: float = 0.12
const BEAT_FALL_DURATION: float = 0.12
const BEAT_INTERVAL: float = 0.60
const BEAT_SCALE_PEAK: Vector2 = Vector2(1.5, 1.5)
const BEAT_SCALE_REST: Vector2 = Vector2(1.0, 1.0)


func _ready() -> void:
	_start_heartbeat_loop()


func _start_heartbeat_loop() -> void:
	var dot: Node2D = get_node_or_null("HeartbeatDot") as Node2D
	if dot == null:
		return
	var tween: Tween = create_tween()
	tween.set_loops()
	tween.tween_property(dot, "scale", BEAT_SCALE_PEAK, BEAT_RISE_DURATION)
	tween.tween_property(dot, "scale", BEAT_SCALE_REST, BEAT_FALL_DURATION)
	tween.tween_interval(BEAT_INTERVAL)
```

- [ ] **Step 2: Create UltrasoundMachine.tscn**

```
[gd_scene load_steps=2 format=3 uid="uid://cozypaw_ultrasoundmachine"]

[ext_resource type="Script" path="res://scripts/objects/ultrasound_machine.gd" id="1_ultrasound"]

[node name="UltrasoundMachine" type="Node2D"]
script = ExtResource("1_ultrasound")

[node name="MachineBody" type="ColorRect" parent="."]
color = Color(0.68, 0.70, 0.76, 1)
size = Vector2(80, 160)
position = Vector2(-40, -160)

[node name="ScreenFrame" type="ColorRect" parent="."]
color = Color(0.30, 0.32, 0.36, 1)
size = Vector2(68, 52)
position = Vector2(-34, -152)

[node name="Screen" type="ColorRect" parent="."]
color = Color(0.06, 0.08, 0.12, 1)
size = Vector2(60, 44)
position = Vector2(-30, -148)

[node name="HeartbeatDot" type="Node2D" parent="."]
position = Vector2(0, -126)

[node name="HeartbeatShape" type="ColorRect" parent="HeartbeatDot"]
color = Color(0.40, 0.95, 0.60, 1)
size = Vector2(12, 12)
position = Vector2(-6, -6)

[node name="Probe" type="ColorRect" parent="."]
color = Color(0.55, 0.57, 0.62, 1)
size = Vector2(14, 80)
position = Vector2(-7, -30)
```

- [ ] **Step 3: Commit**

```bash
cd "F:/Development/_gameDev/Cozypaw-Hospital"
git add scripts/objects/ultrasound_machine.gd scenes/objects/UltrasoundMachine.tscn
git commit -m "feat(ultrasound): add UltrasoundMachine component with continuous heartbeat animation"
```

---

## Task 2: DeliveryBed component

**Files:**
- Create: `scripts/objects/delivery_bed.gd`
- Create: `scenes/objects/DeliveryBed.tscn`

Tap the bed → Mama slides in from left → Baby fades in on the bed. Tap again → Mama slides out, Baby fades out. Tapping during animation is ignored.

- [ ] **Step 1: Create delivery_bed.gd**

```gdscript
## DeliveryBed — tap to animate mama arriving and baby appearing; tap again to reset.
class_name DeliveryBed extends Node2D

enum State { IDLE, MAMA_ARRIVING, COMPLETE, RESETTING }

const MAMA_OFFSCREEN_X: float = -600.0
const MAMA_PARKED_X: float = -100.0
const ARRIVE_DURATION: float = 1.0
const BABY_FADE_DURATION: float = 0.6
const RESET_DURATION: float = 0.8
const BUTTON_HALF_WIDTH: float = 120.0
const BUTTON_HALF_HEIGHT: float = 40.0

var _state: State = State.IDLE


func _ready() -> void:
	var mama: Node2D = get_node_or_null("Mama") as Node2D
	if mama != null:
		mama.position.x = MAMA_OFFSCREEN_X
	var baby: Node2D = get_node_or_null("Baby") as Node2D
	if baby != null:
		baby.modulate.a = 0.0


func _input(event: InputEvent) -> void:
	if _state == State.MAMA_ARRIVING or _state == State.RESETTING:
		return
	var screen_pos: Vector2
	if event is InputEventScreenTouch and event.pressed:
		screen_pos = event.position
	elif event is InputEventMouseButton and event.pressed and event.button_index == MOUSE_BUTTON_LEFT:
		screen_pos = event.position
	else:
		return
	var canvas_transform: Transform2D = get_viewport().get_canvas_transform()
	var world_pos: Vector2 = canvas_transform.affine_inverse() * screen_pos
	var local_pos: Vector2 = to_local(world_pos)
	if abs(local_pos.x) <= BUTTON_HALF_WIDTH and abs(local_pos.y) <= BUTTON_HALF_HEIGHT:
		if _state == State.IDLE:
			_start_arrival()
		elif _state == State.COMPLETE:
			_start_reset()


func _start_arrival() -> void:
	_state = State.MAMA_ARRIVING
	var mama: Node2D = get_node_or_null("Mama") as Node2D
	if mama == null:
		_state = State.IDLE
		return
	var tween: Tween = create_tween()
	tween.set_ease(Tween.EASE_OUT)
	tween.set_trans(Tween.TRANS_QUAD)
	tween.tween_property(mama, "position:x", MAMA_PARKED_X, ARRIVE_DURATION)
	tween.finished.connect(_on_mama_arrived)


func _on_mama_arrived() -> void:
	_state = State.COMPLETE
	var baby: Node2D = get_node_or_null("Baby") as Node2D
	if baby == null:
		return
	var tween: Tween = create_tween()
	tween.tween_property(baby, "modulate:a", 1.0, BABY_FADE_DURATION)


func _start_reset() -> void:
	_state = State.RESETTING
	var baby: Node2D = get_node_or_null("Baby") as Node2D
	if baby != null:
		var fade_tween: Tween = create_tween()
		fade_tween.tween_property(baby, "modulate:a", 0.0, BABY_FADE_DURATION)
	var mama: Node2D = get_node_or_null("Mama") as Node2D
	if mama == null:
		_state = State.IDLE
		return
	var slide_tween: Tween = create_tween()
	slide_tween.set_ease(Tween.EASE_IN)
	slide_tween.set_trans(Tween.TRANS_QUAD)
	slide_tween.tween_property(mama, "position:x", MAMA_OFFSCREEN_X, RESET_DURATION)
	slide_tween.finished.connect(func() -> void: _state = State.IDLE)
```

- [ ] **Step 2: Create DeliveryBed.tscn**

```
[gd_scene load_steps=2 format=3 uid="uid://cozypaw_deliverybed"]

[ext_resource type="Script" path="res://scripts/objects/delivery_bed.gd" id="1_deliverybed"]

[node name="DeliveryBed" type="Node2D"]
script = ExtResource("1_deliverybed")

[node name="BedFrame" type="ColorRect" parent="."]
color = Color(0.85, 0.85, 0.90, 1)
size = Vector2(260, 50)
position = Vector2(-130, -50)

[node name="BedPillow" type="ColorRect" parent="."]
color = Color(0.96, 0.96, 1.0, 1)
size = Vector2(80, 50)
position = Vector2(-130, -100)

[node name="BedLeg1" type="ColorRect" parent="."]
color = Color(0.70, 0.70, 0.76, 1)
size = Vector2(14, 120)
position = Vector2(-120, 0)

[node name="BedLeg2" type="ColorRect" parent="."]
color = Color(0.70, 0.70, 0.76, 1)
size = Vector2(14, 120)
position = Vector2(106, 0)

[node name="Mama" type="Node2D" parent="."]
position = Vector2(-600, 0)

[node name="MamaBody" type="ColorRect" parent="Mama"]
color = Color(0.92, 0.75, 0.65, 1)
size = Vector2(60, 100)
position = Vector2(-30, -100)

[node name="MamaHead" type="ColorRect" parent="Mama"]
color = Color(0.92, 0.75, 0.65, 1)
size = Vector2(50, 50)
position = Vector2(-25, -150)

[node name="Baby" type="Node2D" parent="."]
position = Vector2(0, -80)

[node name="BabyBody" type="ColorRect" parent="Baby"]
color = Color(0.96, 0.88, 0.82, 1)
size = Vector2(40, 30)
position = Vector2(-20, -15)
```

- [ ] **Step 3: Commit**

```bash
cd "F:/Development/_gameDev/Cozypaw-Hospital"
git add scripts/objects/delivery_bed.gd scenes/objects/DeliveryBed.tscn
git commit -m "feat(delivery): add DeliveryBed component with mama-arrives baby-appears animation"
```

---

## Task 3: Cradle component

**Files:**
- Create: `scripts/objects/cradle.gd`
- Create: `scenes/objects/Cradle.tscn`

Tap the cradle → it rocks (rotates ±15°). The origin is at the top attachment point, so rotation creates a natural pendulum swing. Tapping during rocking is ignored.

- [ ] **Step 1: Create cradle.gd**

```gdscript
## Cradle — rocks with a pendulum rotation when tapped.
class_name Cradle extends Node2D

enum State { IDLE, ROCKING }

const ROCK_ANGLE: float = 15.0
const ROCK_DURATION: float = 0.5
const BUTTON_HALF_SIZE: float = 80.0

var _state: State = State.IDLE


func _input(event: InputEvent) -> void:
	if _state != State.IDLE:
		return
	var screen_pos: Vector2
	if event is InputEventScreenTouch and event.pressed:
		screen_pos = event.position
	elif event is InputEventMouseButton and event.pressed and event.button_index == MOUSE_BUTTON_LEFT:
		screen_pos = event.position
	else:
		return
	var canvas_transform: Transform2D = get_viewport().get_canvas_transform()
	var world_pos: Vector2 = canvas_transform.affine_inverse() * screen_pos
	var local_pos: Vector2 = to_local(world_pos)
	if abs(local_pos.x) <= BUTTON_HALF_SIZE and abs(local_pos.y) <= BUTTON_HALF_SIZE:
		_start_rocking()


func _start_rocking() -> void:
	_state = State.ROCKING
	var tween: Tween = create_tween()
	tween.set_ease(Tween.EASE_IN_OUT)
	tween.set_trans(Tween.TRANS_SINE)
	tween.tween_property(self, "rotation_degrees", ROCK_ANGLE, ROCK_DURATION)
	tween.tween_property(self, "rotation_degrees", -ROCK_ANGLE, ROCK_DURATION)
	tween.tween_property(self, "rotation_degrees", 0.0, ROCK_DURATION * 0.5)
	tween.finished.connect(func() -> void: _state = State.IDLE)
```

- [ ] **Step 2: Create Cradle.tscn**

```
[gd_scene load_steps=2 format=3 uid="uid://cozypaw_cradle"]

[ext_resource type="Script" path="res://scripts/objects/cradle.gd" id="1_cradle"]

[node name="Cradle" type="Node2D"]
script = ExtResource("1_cradle")

[node name="SuspensionLeft" type="ColorRect" parent="."]
color = Color(0.75, 0.65, 0.50, 1)
size = Vector2(4, 50)
position = Vector2(-25, 0)

[node name="SuspensionRight" type="ColorRect" parent="."]
color = Color(0.75, 0.65, 0.50, 1)
size = Vector2(4, 50)
position = Vector2(21, 0)

[node name="CradleBasket" type="ColorRect" parent="."]
color = Color(0.88, 0.82, 0.72, 1)
size = Vector2(70, 40)
position = Vector2(-35, 50)

[node name="CradleRim" type="ColorRect" parent="."]
color = Color(0.95, 0.90, 0.82, 1)
size = Vector2(70, 8)
position = Vector2(-35, 46)

[node name="BabyBlanket" type="ColorRect" parent="."]
color = Color(0.90, 0.84, 0.96, 1)
size = Vector2(58, 22)
position = Vector2(-29, 56)
```

- [ ] **Step 3: Commit**

```bash
cd "F:/Development/_gameDev/Cozypaw-Hospital"
git add scripts/objects/cradle.gd scenes/objects/Cradle.tscn
git commit -m "feat(nursery): add Cradle component with pendulum rocking animation"
```

---

## Task 4: Ultrasound room scene

**Files:**
- Create: `scenes/rooms/floor2/Ultrasound.tscn`

- [ ] **Step 1: Create Ultrasound.tscn**

```
[gd_scene load_steps=3 format=3 uid="uid://cozypaw_ultrasound"]

[ext_resource type="PackedScene" path="res://scenes/objects/InteractiveObject.tscn" id="1_iobj"]
[ext_resource type="PackedScene" path="res://scenes/objects/UltrasoundMachine.tscn" id="2_ultrasound"]

[node name="Ultrasound" type="Node2D"]

[node name="Background" type="ColorRect" parent="."]
color = Color(0.92, 0.90, 0.96, 1)
size = Vector2(1280, 720)
position = Vector2(0, 0)

[node name="Floor" type="ColorRect" parent="."]
color = Color(0.80, 0.78, 0.84, 1)
size = Vector2(1280, 100)
position = Vector2(0, 620)

[node name="WallLeft" type="ColorRect" parent="."]
color = Color(0.90, 0.88, 0.94, 1)
size = Vector2(40, 620)
position = Vector2(0, 0)

[node name="WallRight" type="ColorRect" parent="."]
color = Color(0.90, 0.88, 0.94, 1)
size = Vector2(40, 620)
position = Vector2(1240, 0)

[node name="ExamTable" type="ColorRect" parent="."]
color = Color(0.84, 0.86, 0.90, 1)
size = Vector2(340, 40)
position = Vector2(300, 490)

[node name="ExamTableLeg1" type="ColorRect" parent="."]
color = Color(0.65, 0.68, 0.74, 1)
size = Vector2(16, 130)
position = Vector2(320, 530)

[node name="ExamTableLeg2" type="ColorRect" parent="."]
color = Color(0.65, 0.68, 0.74, 1)
size = Vector2(16, 130)
position = Vector2(608, 530)

[node name="CharacterSpawn" type="Marker2D" parent="."]
position = Vector2(160, 490)

[node name="UltrasoundMachine" parent="." instance=ExtResource("2_ultrasound")]
position = Vector2(780, 490)

[node name="GelBottle" parent="." instance=ExtResource("1_iobj")]
position = Vector2(920, 450)

[node name="Blanket" parent="." instance=ExtResource("1_iobj")]
position = Vector2(480, 450)
```

- [ ] **Step 2: Commit**

```bash
cd "F:/Development/_gameDev/Cozypaw-Hospital"
git add scenes/rooms/floor2/Ultrasound.tscn
git commit -m "feat(ultrasound): add Ultrasound room with exam table and UltrasoundMachine"
```

---

## Task 5: DeliveryRoom scene

**Files:**
- Create: `scenes/rooms/floor2/DeliveryRoom.tscn`

- [ ] **Step 1: Create DeliveryRoom.tscn**

```
[gd_scene load_steps=3 format=3 uid="uid://cozypaw_deliveryroom"]

[ext_resource type="PackedScene" path="res://scenes/objects/InteractiveObject.tscn" id="1_iobj"]
[ext_resource type="PackedScene" path="res://scenes/objects/DeliveryBed.tscn" id="2_deliverybed"]

[node name="DeliveryRoom" type="Node2D"]

[node name="Background" type="ColorRect" parent="."]
color = Color(0.98, 0.92, 0.94, 1)
size = Vector2(1280, 720)
position = Vector2(0, 0)

[node name="Floor" type="ColorRect" parent="."]
color = Color(0.90, 0.82, 0.76, 1)
size = Vector2(1280, 100)
position = Vector2(0, 620)

[node name="WallLeft" type="ColorRect" parent="."]
color = Color(0.96, 0.90, 0.92, 1)
size = Vector2(40, 620)
position = Vector2(0, 0)

[node name="WallRight" type="ColorRect" parent="."]
color = Color(0.96, 0.90, 0.92, 1)
size = Vector2(40, 620)
position = Vector2(1240, 0)

[node name="CharacterSpawn" type="Marker2D" parent="."]
position = Vector2(160, 490)

[node name="DeliveryBed" parent="." instance=ExtResource("2_deliverybed")]
position = Vector2(540, 490)

[node name="FlowerVase" parent="." instance=ExtResource("1_iobj")]
position = Vector2(1020, 540)

[node name="BabyBlanket" parent="." instance=ExtResource("1_iobj")]
position = Vector2(880, 540)
```

- [ ] **Step 2: Commit**

```bash
cd "F:/Development/_gameDev/Cozypaw-Hospital"
git add scenes/rooms/floor2/DeliveryRoom.tscn
git commit -m "feat(delivery): add DeliveryRoom with animated DeliveryBed"
```

---

## Task 6: Nursery scene

**Files:**
- Create: `scenes/rooms/floor2/Nursery.tscn`

The CradleRail is a horizontal bar that the cradles visually hang from. The three Cradle origins (top attachment points) are positioned at y=240, just below the rail bottom edge (rail top at y=228, size.y=12 → bottom at y=240).

- [ ] **Step 1: Create Nursery.tscn**

```
[gd_scene load_steps=3 format=3 uid="uid://cozypaw_nursery"]

[ext_resource type="PackedScene" path="res://scenes/objects/InteractiveObject.tscn" id="1_iobj"]
[ext_resource type="PackedScene" path="res://scenes/objects/Cradle.tscn" id="2_cradle"]

[node name="Nursery" type="Node2D"]

[node name="Background" type="ColorRect" parent="."]
color = Color(0.96, 0.96, 0.84, 1)
size = Vector2(1280, 720)
position = Vector2(0, 0)

[node name="Floor" type="ColorRect" parent="."]
color = Color(0.88, 0.84, 0.70, 1)
size = Vector2(1280, 100)
position = Vector2(0, 620)

[node name="WallLeft" type="ColorRect" parent="."]
color = Color(0.94, 0.94, 0.82, 1)
size = Vector2(40, 620)
position = Vector2(0, 0)

[node name="WallRight" type="ColorRect" parent="."]
color = Color(0.94, 0.94, 0.82, 1)
size = Vector2(40, 620)
position = Vector2(1240, 0)

[node name="CradleRail" type="ColorRect" parent="."]
color = Color(0.75, 0.65, 0.50, 1)
size = Vector2(800, 12)
position = Vector2(200, 228)

[node name="CharacterSpawn" type="Marker2D" parent="."]
position = Vector2(160, 490)

[node name="Cradle1" parent="." instance=ExtResource("2_cradle")]
position = Vector2(340, 240)

[node name="Cradle2" parent="." instance=ExtResource("2_cradle")]
position = Vector2(600, 240)

[node name="Cradle3" parent="." instance=ExtResource("2_cradle")]
position = Vector2(860, 240)

[node name="TeddyBear" parent="." instance=ExtResource("1_iobj")]
position = Vector2(1100, 540)

[node name="MilkBottle" parent="." instance=ExtResource("1_iobj")]
position = Vector2(960, 540)
```

- [ ] **Step 2: Commit**

```bash
cd "F:/Development/_gameDev/Cozypaw-Hospital"
git add scenes/rooms/floor2/Nursery.tscn
git commit -m "feat(nursery): add Nursery room with rail and three rocking cradles"
```

---

## Task 7: Update Main.tscn — wire up Floor 2

**Files:**
- Modify: `scenes/main/Main.tscn`

**Changes from current file:**
1. `load_steps` increases from 17 → 20 (add 3 new ext_resources: Ultrasound, DeliveryRoom, Nursery)
2. Add 3 new ext_resource declarations (ids 16–18)
3. In the Floor2 section: **remove** the placeholder `Background`, `FloorLabel`, `FloorRect` nodes
4. **Add** 3 room instances to Floor2 at x offsets 0, 1280, 2560 *(no room 3)*
5. **Move** ElevatorDown2 from (1200, 360) → (1100, 540) *(consistent with Floor1 pattern)*
6. **Add** 4 NavigationArrow instances for Floor2 room navigation *(only 2 boundaries, not 3)*

**load_steps arithmetic:** 15 existing ext_resources + 3 new = 18 ext_resources + 1 sub_resource + 1 scene root = 20.

- [ ] **Step 1: Read current Main.tscn**

Read `F:/Development/_gameDev/Cozypaw-Hospital/scenes/main/Main.tscn` to confirm current state before writing.

- [ ] **Step 2: Write the complete new Main.tscn**

```
[gd_scene load_steps=20 format=3 uid="uid://cozypaw_main"]

[ext_resource type="Script" path="res://scripts/main/main.gd" id="1_main"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor0/Reception.tscn" id="2_reception"]
[ext_resource type="PackedScene" path="res://scenes/characters/Character.tscn" id="3_char"]
[ext_resource type="PackedScene" path="res://scenes/ui/HUD.tscn" id="4_hud"]
[ext_resource type="PackedScene" path="res://scenes/ui/SettingsMenu.tscn" id="5_settings"]
[ext_resource type="PackedScene" path="res://scenes/objects/ElevatorButton.tscn" id="6_elevbtn"]
[ext_resource type="Script" path="res://scripts/characters/character_data.gd" id="7_chardata"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor0/GiftShop.tscn" id="8_giftshop"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor0/Restaurant.tscn" id="9_restaurant"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor0/EmergencyRoom.tscn" id="10_emergency"]
[ext_resource type="PackedScene" path="res://scenes/objects/NavigationArrow.tscn" id="11_navarrow"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor1/XRay.tscn" id="12_xray"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor1/Pharmacy.tscn" id="13_pharmacy"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor1/Lab.tscn" id="14_lab"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor1/PatientRoom.tscn" id="15_patientroom"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor2/Ultrasound.tscn" id="16_ultrasound"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor2/DeliveryRoom.tscn" id="17_delivery"]
[ext_resource type="PackedScene" path="res://scenes/rooms/floor2/Nursery.tscn" id="18_nursery"]

[sub_resource type="Resource" id="CharacterData_bunny1"]
script = ExtResource("7_chardata")
id = "bunny_01"
display_name = "Bunny"
species = 0
state = 0
current_floor = 0
position = Vector2(0, 0)

[node name="Main" type="Node2D"]
script = ExtResource("1_main")

[node name="Camera2D" type="Camera2D" parent="."]
position = Vector2(640, 360)
zoom = Vector2(1, 1)

[node name="Hospital" type="Node2D" parent="."]

[node name="Floor0" type="Node2D" parent="Hospital"]
position = Vector2(0, 0)

[node name="Reception" parent="Hospital/Floor0" instance=ExtResource("2_reception")]
position = Vector2(0, 0)

[node name="GiftShop" parent="Hospital/Floor0" instance=ExtResource("8_giftshop")]
position = Vector2(1280, 0)

[node name="Restaurant" parent="Hospital/Floor0" instance=ExtResource("9_restaurant")]
position = Vector2(2560, 0)

[node name="EmergencyRoom" parent="Hospital/Floor0" instance=ExtResource("10_emergency")]
position = Vector2(3840, 0)

[node name="ElevatorUp0" parent="Hospital/Floor0" instance=ExtResource("6_elevbtn")]
position = Vector2(1100, 160)
target_floor = 1

[node name="NavRight0to1" parent="Hospital/Floor0" instance=ExtResource("11_navarrow")]
position = Vector2(1200, 480)
target_floor = 0
target_room = 1
label_text = "→"

[node name="NavLeft1to0" parent="Hospital/Floor0" instance=ExtResource("11_navarrow")]
position = Vector2(1340, 480)
target_floor = 0
target_room = 0
label_text = "←"

[node name="NavRight1to2" parent="Hospital/Floor0" instance=ExtResource("11_navarrow")]
position = Vector2(2480, 480)
target_floor = 0
target_room = 2
label_text = "→"

[node name="NavLeft2to1" parent="Hospital/Floor0" instance=ExtResource("11_navarrow")]
position = Vector2(2600, 480)
target_floor = 0
target_room = 1
label_text = "←"

[node name="NavRight2to3" parent="Hospital/Floor0" instance=ExtResource("11_navarrow")]
position = Vector2(3760, 480)
target_floor = 0
target_room = 3
label_text = "→"

[node name="NavLeft3to2" parent="Hospital/Floor0" instance=ExtResource("11_navarrow")]
position = Vector2(3920, 480)
target_floor = 0
target_room = 2
label_text = "←"

[node name="Floor1" type="Node2D" parent="Hospital"]
position = Vector2(0, -720)

[node name="XRay" parent="Hospital/Floor1" instance=ExtResource("12_xray")]
position = Vector2(0, 0)

[node name="Pharmacy" parent="Hospital/Floor1" instance=ExtResource("13_pharmacy")]
position = Vector2(1280, 0)

[node name="Lab" parent="Hospital/Floor1" instance=ExtResource("14_lab")]
position = Vector2(2560, 0)

[node name="PatientRoom" parent="Hospital/Floor1" instance=ExtResource("15_patientroom")]
position = Vector2(3840, 0)

[node name="ElevatorDown1" parent="Hospital/Floor1" instance=ExtResource("6_elevbtn")]
position = Vector2(1100, 540)
target_floor = 0

[node name="ElevatorUp1" parent="Hospital/Floor1" instance=ExtResource("6_elevbtn")]
position = Vector2(1100, 180)
target_floor = 2

[node name="NavRight0to1_F1" parent="Hospital/Floor1" instance=ExtResource("11_navarrow")]
position = Vector2(1200, 480)
target_floor = 1
target_room = 1
label_text = "→"

[node name="NavLeft1to0_F1" parent="Hospital/Floor1" instance=ExtResource("11_navarrow")]
position = Vector2(1340, 480)
target_floor = 1
target_room = 0
label_text = "←"

[node name="NavRight1to2_F1" parent="Hospital/Floor1" instance=ExtResource("11_navarrow")]
position = Vector2(2480, 480)
target_floor = 1
target_room = 2
label_text = "→"

[node name="NavLeft2to1_F1" parent="Hospital/Floor1" instance=ExtResource("11_navarrow")]
position = Vector2(2600, 480)
target_floor = 1
target_room = 1
label_text = "←"

[node name="NavRight2to3_F1" parent="Hospital/Floor1" instance=ExtResource("11_navarrow")]
position = Vector2(3760, 480)
target_floor = 1
target_room = 3
label_text = "→"

[node name="NavLeft3to2_F1" parent="Hospital/Floor1" instance=ExtResource("11_navarrow")]
position = Vector2(3920, 480)
target_floor = 1
target_room = 2
label_text = "←"

[node name="Floor2" type="Node2D" parent="Hospital"]
position = Vector2(0, -1440)

[node name="Ultrasound" parent="Hospital/Floor2" instance=ExtResource("16_ultrasound")]
position = Vector2(0, 0)

[node name="DeliveryRoom" parent="Hospital/Floor2" instance=ExtResource("17_delivery")]
position = Vector2(1280, 0)

[node name="Nursery" parent="Hospital/Floor2" instance=ExtResource("18_nursery")]
position = Vector2(2560, 0)

[node name="ElevatorDown2" parent="Hospital/Floor2" instance=ExtResource("6_elevbtn")]
position = Vector2(1100, 540)
target_floor = 1

[node name="NavRight0to1_F2" parent="Hospital/Floor2" instance=ExtResource("11_navarrow")]
position = Vector2(1200, 480)
target_floor = 2
target_room = 1
label_text = "→"

[node name="NavLeft1to0_F2" parent="Hospital/Floor2" instance=ExtResource("11_navarrow")]
position = Vector2(1340, 480)
target_floor = 2
target_room = 0
label_text = "←"

[node name="NavRight1to2_F2" parent="Hospital/Floor2" instance=ExtResource("11_navarrow")]
position = Vector2(2480, 480)
target_floor = 2
target_room = 2
label_text = "→"

[node name="NavLeft2to1_F2" parent="Hospital/Floor2" instance=ExtResource("11_navarrow")]
position = Vector2(2600, 480)
target_floor = 2
target_room = 1
label_text = "←"

[node name="Characters" type="Node2D" parent="."]

[node name="Bunny1" parent="Characters" instance=ExtResource("3_char")]
position = Vector2(300, 400)
data = SubResource("CharacterData_bunny1")

[node name="UI" type="CanvasLayer" parent="."]

[node name="HUD" parent="UI" instance=ExtResource("4_hud")]

[node name="SettingsMenu" parent="UI" instance=ExtResource("5_settings")]
```

- [ ] **Step 3: Commit and push**

```bash
cd "F:/Development/_gameDev/Cozypaw-Hospital"
git add scenes/main/Main.tscn
git commit -m "feat(floor2): wire up all three second-floor rooms with navigation arrows"
git push origin develop
```

---

## Self-Review: Spec Coverage Check

| Sprint 11-13 requirement | Covered by |
|--------------------------|-----------|
| Ultraschall (sanfte Herzschlag-Animation) | Task 1: UltrasoundMachine with looping scale tween on HeartbeatDot; Task 4: Ultrasound room |
| Kreißsaal (Mama kommt rein, Baby ist da) | Task 2: DeliveryBed 4-state FSM (tap → mama slides in → baby fades in → tap → reset); Task 5: DeliveryRoom |
| Säuglingsstation mit Wiegen | Task 3: Cradle with pendulum rotation; Task 6: Nursery with 3 Cradle instances on a rail |
| All rooms accessible via elevator + horizontal nav | Task 7: Main.tscn with 4 nav arrows for 2 boundaries + ElevatorDown2 |
| Keine Gift-Mechaniken (product principle) | All interactive objects: GelBottle, Blanket, FlowerVase, BabyBlanket, TeddyBear, MilkBottle — all safe/positive |

**Placeholder scan:** All code blocks complete. No TBD or TODO. Node paths referenced in scripts match scenes:
- `ultrasound_machine.gd` → `"HeartbeatDot"` — exists as direct child of UltrasoundMachine ✓
- `delivery_bed.gd` → `"Mama"` (Node2D), `"Baby"` (Node2D) — both exist as direct children of DeliveryBed ✓
- `cradle.gd` → rotates `self` — no node path lookup needed ✓

**Type consistency:**
- `_on_mama_arrived()` used as `tween.finished.connect(_on_mama_arrived)` — method callable, matches function signature ✓
- `Baby.modulate:a` tweened as float — `modulate` is Color, `:a` accesses the alpha channel as float ✓
- `MAMA_OFFSCREEN_X = -600.0` used in `_ready()` and `_start_reset()` — consistent ✓
- `MAMA_PARKED_X = -100.0` used only in `_start_arrival()` ✓
- `rotation_degrees` tweened as float (ROCK_ANGLE = 15.0) — matches `self.rotation_degrees` property type ✓

**Floor2 room count:** 3 rooms (not 4). Nav arrows: 4 total (2 boundaries × 2 directions). ElevatorDown2 only (no ElevatorUp2 — Floor 2 is the top floor). ✓

---

## Smoke Test Checklist (manual, on device after completion)

- [ ] Elevator from Floor 1 lands at Floor 2 Ultrasound room
- [ ] Heartbeat animation starts automatically on entering Ultrasound room (green dot pulses every ~0.84s)
- [ ] "→" navigates Floor 2: Ultrasound → DeliveryRoom → Nursery and back with "←"
- [ ] No "→" arrow visible in Nursery room (no room 3)
- [ ] Tapping DeliveryBed: Mama slides in from left, Baby appears
- [ ] Tapping DeliveryBed again: Mama slides out left, Baby disappears
- [ ] Tapping DeliveryBed during animation: nothing happens (state guard)
- [ ] Tapping any Cradle: cradle rocks (swings ±15°, returns to center)
- [ ] Tapping Cradle during rocking: nothing (state guard)
- [ ] All interactive objects (GelBottle, Blanket, FlowerVase, BabyBlanket, TeddyBear, MilkBottle) bounce on tap
- [ ] Elevator Down from Floor 2 → Floor 1 XRay room
- [ ] Bunny can be dragged to Floor 2