@dongtuuyen haven‘t read anyone here mentioning he/she develop a game in lua, but libretro has some examples of functional games here: https://github.com/libretro/lutro-platformer https://github.com/libretro/lutro-game-of-life https://github.com/libretro/lutro-snake https://github.com/libretro/lutro-tetris https://github.com/libretro/lutro-iyfct https://github.com/libretro/lutro-pong

@lucas2699 have you tried using lutro on other platform? It might be related to the game more than recalbox.

@Substring It seems to use Love Free 2d Game engine that runs on Lua. https://love2d.org/