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Making a game on a custom bytecode VM in 7 days and 3kB

Laurent Le Brun built a shoot 'em up game in 7 days with a total size of just 3KB by embedding a custom bytecode VM and using a fullscreen GLSL pixel shader for rendering. The project was created for Langjam, a 7-day challenge requiring participants to design a programming language and then use it to build a game, drawing inspiration from demoscene productions like Ikadalawampu and kkrieger.

Background

The demoscene is a computer art subculture focused on creating small, visually impressive programs under strict size constraints. This project continues that tradition by combining language design, bytecode interpretation, and procedural graphics into an extremely compact executable.

Source
Lobsters
Published
Aug 12, 2026 at 11:00 AM
Score
6.0 / 10