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-# Downstroke Demo Games Design
-
-**Date:** 2026-04-05
-**Status:** Approved
-**Scope:** `demo/` folder, 5 demo games, Makefile `make demos` target, CLAUDE.md update
-
----
-
-## Goal
-
-Provide 5 small self-contained demo games in `demo/` that collectively exercise every engine system. Each demo compiles to its own executable (`bin/demo-*`). They replace the macroknight integration test for Milestone 8 and serve as living documentation of the engine API.
-
----
-
-## File Layout
-
-```
-demo/
-  assets/                        ← copied from macroknight/assets (not symlinked)
-    monochrome-transparent.png   ← tileset spritesheet
-    monochrome_transparent.tsx   ← tileset metadata (TSX)
-    level-0.tmx                  ← level used by platformer, topdown, sandbox
-    DejaVuSans.ttf               ← font for audio demo text
-    jump.wav                     ← sound effect (platformer jump, shmup shoot)
-    theme.ogg                    ← music (audio demo)
-  platformer.scm
-  shmup.scm
-  topdown.scm
-  audio.scm
-  sandbox.scm
-```
-
-**Omitted from copy:** `prefabs.scm`, `macroknight.tiled-project`, `macroknight.tiled-session` — macroknight-specific files not needed by any demo.
-
----
-
-## Build
-
-### Makefile additions
-
-```makefile
-DEMO_NAMES := platformer shmup topdown audio sandbox
-DEMO_BINS  := $(patsubst %,bin/demo-%,$(DEMO_NAMES))
-
-demos: engine $(DEMO_BINS)
-
-bin/demo-%: demo/%.scm $(OBJECT_FILES) | bin
-	csc demo/$*.scm $(OBJECT_FILES) -o bin/demo-$* -I bin
-```
-
-- `make` — builds engine modules only (unchanged)
-- `make demos` — builds all 5 demo executables; depends on engine being built first
-- Demos are compiled as programs (not units), linked against all engine `.o` files
-
-### CLAUDE.md update
-
-Add to the Build & Test section:
-
-> `make demos` must always succeed. A demo that fails to compile is a build failure. Run `make && make demos` to verify both engine and demos build cleanly.
-
----
-
-## Demo Code Pattern
-
-Every demo follows this ~30-line structure:
-
-```scheme
-(import (prefix sdl2 "sdl2:")
-        (prefix sdl2-ttf "ttf:")
-        (prefix sdl2-image "img:")
-        downstroke/engine
-        downstroke/world
-        downstroke/tilemap
-        downstroke/renderer
-        downstroke/input
-        downstroke/physics
-        downstroke/assets)
-
-(define *game*
-  (make-game
-    title: "Demo: <Name>" width: 600 height: 400
-    preload: (lambda (game) ...)   ;; load tilemap, tileset texture, sounds
-    create:  (lambda (game) ...)   ;; build scene, place entities
-    update:  (lambda (game dt) ...)  ;; input dispatch, physics calls
-    render:  (lambda (game) ...)))   ;; HUD overlay (optional)
-
-(game-run! *game*)
-```
-
-Tile IDs in entity plists are placeholder values — to be adjusted visually after first run.
-
----
-
-## The 5 Demos
-
-### 1. `demo/platformer.scm` — Platformer
-
-**Systems exercised:** `input`, `physics` (gravity + tile collision), `renderer` (tilemap + entities), `world`/scene, camera follow, audio (sound effect)
-
-**Mechanics:**
-- Player entity with gravity, left/right movement, jump
-- Tile collision via `apply-physics` from `physics.scm`
-- Camera follows player horizontally
-- Jump sound via macroknight's `sound.scm` (or direct SDL_mixer call)
-- Level: `demo/assets/level-0.tmx`
-- Tile IDs: placeholder (user adjusts)
-
-**Key entity plist:**
-```scheme
-(list #:type 'player
-      #:x 100 #:y 50
-      #:width 16 #:height 16
-      #:vx 0 #:vy 0
-      #:gravity? #t
-      #:on-ground? #f
-      #:tile-id 1)
-```
-
-**Update logic:** read input → set `#:vx` from left/right → jump sets `#:vy` → call physics step → update camera x to follow player x.
-
----
-
-### 2. `demo/shmup.scm` — Shoot-em-up
-
-**Systems exercised:** `entity` (spawning/removal), entity-entity collision via `physics.scm`, `input`, `renderer`, `world`/scene (no tilemap)
-
-**Mechanics:**
-- Player ship at bottom, moves left/right
-- Space bar fires bullet upward (new entity added to scene)
-- Enemies spawn from top at random x positions every N frames, move downward
-- Bullet-enemy collision: both entities removed from scene
-- No tilemap — plain background (black/SDL clear)
-- No gravity on any entity
-- `jump.wav` plays on shoot
-
-**Key entity plists:**
-```scheme
-;; player
-(list #:type 'player #:x 280 #:y 360 #:width 16 #:height 16 #:vx 0 #:vy 0 #:tile-id 2)
-;; bullet
-(list #:type 'bullet #:x px #:y 340 #:width 4 #:height 8 #:vx 0 #:vy -5 #:tile-id 3)
-;; enemy
-(list #:type 'enemy  #:x rx #:y 0   #:width 16 #:height 16 #:vx 0 #:vy 2 #:tile-id 4)
-```
-
-**Update logic:** move entities by vx/vy each frame → AABB collision check between bullets and enemies → filter dead entities from scene → spawn new enemy every 60 frames → read input for player movement and shoot.
-
----
-
-### 3. `demo/topdown.scm` — Top-down explorer
-
-**Systems exercised:** `input` (8-directional), `renderer` (tilemap + entity), `world`/scene, camera follow (both axes), `physics` (no gravity)
-
-**Mechanics:**
-- Player entity moves in 8 directions (WASD or arrows)
-- No gravity (`#:gravity? #f`)
-- Camera follows player on both x and y axes
-- Level: `demo/assets/level-0.tmx` (same tilemap, different movement feel)
-- No audio
-
-**Update logic:** read input → set `#:vx` and `#:vy` from direction keys → apply tile collision (no gravity component) → update camera to center on player.
-
----
-
-### 4. `demo/audio.scm` — Audio showcase
-
-**Systems exercised:** audio (sound effects + music), `renderer` (text via `draw-ui-text`), `input`, `assets`
-
-**Mechanics:**
-- Static screen with text instructions rendered via `draw-ui-text`
-- Press **J** → play `jump.wav`
-- Press **M** → toggle `theme.ogg` music on/off
-- Press **Escape** → quit
-- No tilemap, no physics, no moving entities
-- Uses `DejaVuSans.ttf` for text
-- Audio calls via macroknight's `sound.scm` functions (`load-sounds!`, `play-sound!`, `load-music!`, `play-music!`, `stop-music!`) — or direct SDL_mixer FFI if sound.scm is not available
-
-**Display:** colored rectangle background + text labels for each key binding.
-
----
-
-### 5. `demo/sandbox.scm` — Physics sandbox
-
-**Systems exercised:** `physics` (gravity + tile collision + entity-entity collision), `renderer`, `world`/scene, no player input
-
-**Mechanics:**
-- 10 entities spawned at random x positions near the top of the screen
-- All have `#:gravity? #t`
-- Physics step runs each frame (gravity accelerates, tile collision stops them)
-- Entities rest on floor tiles or bounce (depending on physics.scm behavior)
-- No player — pure observation of physics pipeline
-- Level: `demo/assets/level-0.tmx`
-- After all entities settle (or after 10 seconds), loop: despawn all, respawn at new random positions
-
----
-
-## Systems Coverage Matrix
-
-| System / Module | platformer | shmup | topdown | audio | sandbox |
-|---|---|---|---|---|---|
-| `engine` (make-game, game-run!) | ✓ | ✓ | ✓ | ✓ | ✓ |
-| `input` | ✓ | ✓ | ✓ | ✓ | — |
-| `physics` (gravity) | ✓ | — | — | — | ✓ |
-| `physics` (tile collision) | ✓ | — | ✓ | — | ✓ |
-| `physics` (entity collision) | — | ✓ | — | — | ✓ |
-| `renderer` (tilemap) | ✓ | — | ✓ | — | ✓ |
-| `renderer` (entities) | ✓ | ✓ | ✓ | — | ✓ |
-| `renderer` (text) | — | — | — | ✓ | — |
-| `world` / scene | ✓ | ✓ | ✓ | — | ✓ |
-| `assets` registry | ✓ | ✓ | ✓ | ✓ | ✓ |
-| audio (sound) | ✓ | ✓ | — | ✓ | — |
-| audio (music) | — | — | — | ✓ | — |
-| camera follow | ✓ (x) | — | ✓ (xy) | — | — |
-
----
-
-## Out of Scope
-
-- Animation state machine (`animation.scm`) — not yet extracted to downstroke
-- AI (`ai.scm`) — not yet extracted
-- Prefab system — not yet extracted
-- Scene transitions — Milestone 9
-- Asset-type-specific load helpers (`game-load-tilemap!` etc.) — Milestone 6