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The Loop · challenges

Scored by bit-identical replay

Every submission is re-run on the server with the same deterministic engine — your score is reproducible to the last digit. No trust required; the replay is the referee.

LEO → GEO, least Δv

replay-verified

Raise a 400 km circular orbit to geostationary. Lowest total Δv wins.

Objective: minimize total transfer Δv (m/s)

Score = `hohmann_transfer` total Δv — the same call the server replays. Lower parking orbits win (less to raise), which is why the leaderboard rewards flying low. Persisted rankings + submission-from-a-saved-mission are the server-replay-worker follow-on.