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04 / Description

Assembly Platformer

An 8-bit platformer written entirely in MIPS assembly, playable in the browser.

  • MIPS assembly
  • sms32v50
  • JavaScript
Play now ↗Video demo ↗
jumps (double jump)
2
item pickups
3

Playable in your browser

Click the game, then use A/D to move, W to jump, S to drop.

The platformer on its 64 by 64 bitmap display
Fig. 1 64 x 64 bitmap display, 4 px per unit

Problem

Write a complete real-time game with no language runtime: no sprites, no engine, just registers, memory and a bitmap display.

Approach

The game targets a 64 x 64 memory-mapped display and the keyboard register. It has movement, double jumping, and three item pickups (slow time, higher jump, super speed). Everything, including collision and drawing, is hand-written assembly.

Key technical decision

To make it playable on the web, I ran the original assembly unchanged: mips.js is a small MIPS interpreter that executes the game_final source, and player.html draws the display to a canvas and feeds key presses into the keyboard registers. There is no port to JavaScript, so what you play is the assembly.

Result

Playable at the link above. Controls: A/D move, W jump (twice for double jump), S drop, R restart, Q quit. Collect the three items, then jump off the top.