diff --git a/assets/audio/sfx/character_pickup.ogg b/assets/audio/sfx/character_pickup.ogg
new file mode 100644
index 0000000..e69de29
diff --git a/assets/audio/sfx/character_place.ogg b/assets/audio/sfx/character_place.ogg
new file mode 100644
index 0000000..e69de29
diff --git a/assets/audio/sfx/character_tap.ogg b/assets/audio/sfx/character_tap.ogg
new file mode 100644
index 0000000..e69de29
diff --git a/assets/audio/sfx/ultrasound_heartbeat.ogg b/assets/audio/sfx/ultrasound_heartbeat.ogg
new file mode 100644
index 0000000..e69de29
diff --git a/docs/audio-assets-sprint19.md b/docs/audio-assets-sprint19.md
index c5750b9..cf304dd 100644
--- a/docs/audio-assets-sprint19.md
+++ b/docs/audio-assets-sprint19.md
@@ -79,3 +79,17 @@ All CC0 or CC-BY from freesound.org. Replace placeholder 0-byte files with the d
 | `assets/audio/sfx/object_tap.ogg` | soft tap / click | search "soft tap" or "gentle click" |
 
 All files must be <1.5 s, child-friendly (no harsh/loud sounds), mono or stereo, 44100 Hz, OGG Vorbis.
+
+## Sprint 22 — Character & Ambient SFX
+
+All CC0 or CC-BY from freesound.org. Replace placeholder 0-byte files with the downloads below.
+
+| File | Description | Freesound suggestion |
+|---|---|---|
+| `assets/audio/sfx/ultrasound_heartbeat.ogg` | soft beep/blip ~1s, loops seamlessly | search "heartbeat beep soft" or "medical monitor beep" |
+| `assets/audio/sfx/character_pickup.ogg` | happy soft squeak / whoosh | search "cartoon pickup soft" or "whoosh gentle" |
+| `assets/audio/sfx/character_place.ogg` | gentle thud / landing | search "soft thud" or "gentle landing" |
+| `assets/audio/sfx/character_tap.ogg` | short happy chime / pop | search "happy chime short" or "cartoon pop soft" |
+
+All files must be child-friendly (no harsh/loud sounds), mono or stereo, 44100 Hz, OGG Vorbis.
+`ultrasound_heartbeat.ogg` must loop seamlessly (start and end points match).