SMRTR AIJul 14, 2026Hacker News

LeMario: Training a JEPA World Model on Super Mario Bros

SMRTR summary

A developer built LeMario, a world model trained on Super Mario Bros using LeCun's JEPA architecture, to predict future game states from pixels and button inputs. The model learned short-horizon dynamics well, beating baselines by 45.5% over five steps, but failed at actual gameplay because visually similar locations fooled the planner and vertical movement was poorly represented.

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