What it is
An experimental controller that lets TypeSafe's Jev model directly choose NES controller inputs for the original Super Mario Bros., using emulator telemetry and RAM rather than screenshots.
How it uses Jev
Each decision, Jev receives compact object-centric JSON (player, trajectory, hazard, terrain, reaction_timing, recent_control, episode) and evaluates three judgments: a Choice selects the next controller macro, a Noul estimates whether a forward jump is useful, and a Score measures immediate danger. The chosen action is sent to the emulator, which advances several frames.
Primitives:choicenoulscore
Technique worth stealing
Translate emulator telemetry and RAM into compact, object-centric JSON instead of screenshots, keeping timing arithmetic in code.
Try it
py -3.13 -m venv .venv; .venv\Scripts\python -m pip install -e ".[mario,dev]"; set TYPESAFE_API_KEY; .venv\Scripts\typesafe-mario play --env SuperMarioBros-1-1-v0 --frames-per-decision 8
Evidence
Each line is one question put to Jev about the README. ≥ 0.60 reads as yes, ≤ 0.40 as no; in between Jev is not making a call.
- Jev-centricyes0.94
- Shows a System One patternyes0.83
- Handles uncertaintyno0.04
- Measuredno0.07
- Runnableno0.34
- Worth recommendingunclear0.52
- Model replicano0.08
- Problem scopescore on a 0–2 scale0.03
- About Jevyes0.98
Signals by Jev jev-1.13.0, card written by DeepSeek V4.1 Flash from the README on 20 Sept 2026.