Physics Patterns

Collision, movement, gravity

Patterns

Platforms

Commodore 64

1 pattern

Commodore 64beginner

Sprite Movement with Bounds

Move sprites with joystick input and screen boundary clamping. Handle the VIC-II's 9-bit X coordinate.

Sinclair ZX Spectrum

1 pattern

Sinclair ZX Spectrumbeginner

Grid Movement with Bounds

Move an entity on a grid with boundary checking. Prevents moving outside the play area.

Nintendo Entertainment System

1 pattern

Nintendo Entertainment Systembeginner

Sprite Movement with Bounds

Move sprites with D-pad input and screen boundary clamping. Essential for player-controlled objects.

Commodore Amiga

1 pattern

Commodore Amigabeginner

Sprite Movement with Bounds

Move sprites with joystick input and play area boundary clamping. Foundation for player control.

Cross-Platform

3 patterns

Cross-Platformbeginner

AABB Collision Detection

Axis-Aligned Bounding Box collision — fast rectangle overlap test for sprites and objects.

Cross-Platformintermediate

Fixed-Point Math

Fractional values without floating point. Essential for smooth movement and physics on 8/16-bit CPUs.

Cross-Platformbeginner

The Grace Window

A second of invulnerability after every respawn, covering every damage source, made visible by blinking the player. Without it, dying once where a hazard sits can spend every life in as many frames.

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