One runnable example per roadmap phase (see spec §10), numbered in order:

• 01_centered_ship.py: Phase 1
• 01c_shapes.py: Phase 1c (CSS colors, rectangle and circle sprites)
• 02_bouncing_ship.py: Phase 2
• Phase 3's stress test lives in benches/ (see benches/README.md)
• 04_keyboard_ship.py: Phase 4. Arrow keys or WASD steer the ship; Space re-centers it. In the browser: http://localhost:8000/web/?example=04_keyboard_ship (click the game to focus it).
• 06_showcase.py: performance showcase. Thousands of balls bouncing off walls and each other; =/- add or remove 1,000, T switches bouncing between the engine and Python, Space pauses; stats print to the console every second. Options: --balls N, --seconds S. Browser: ?example=06_showcase (stats in the developer console).
• 05_collisions.py: Phase 5. Steer the ship (arrow keys or WASD) through drifting asteroids; touched asteroids disappear and the title counts hits. Gold circles use CircleCollider, tomato squares BoxCollider, light blue squares AABBCollider. Browser: ?example=05_collisions.