tl;dr: A developer ported their C-rewritten JavaScript game engine ("high_impact") to the N64 using the open-source Libdragon and Tiny3D libraries, creating Xibalba 64—a Wolfenstein 3D-style FPS that runs at a stable 60 FPS. The game is being published by Modretro as a physical cartridge launch title for their M64 console clone, making it only the second new commercial N64 release since 2002. The post details technical challenges including the N64's 4KB texture memory limit, raycasting-based visibility culling, batched draw calls, and using VADPCM audio compression (with 31MB of the 32MB ROM devoted to sound).