Add RetroSpaceDuel two-player environment (revives #92) - #197
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Revives the RetroSpaceDuel game (originally proposed in TextArena#92) ported to the current TextArena environment API: - State created in reset() as TwoPlayerState; reset(num_players, seed). - Observations use ObservationType; invalid moves use set_invalid_move(reason=). - Single-winner outcomes use set_winner(); turn-limit resolves by health (draw on a tie) via check_turn_limit(). - Action parser tolerates ActionFormattingWrapper brackets (e.g. [f w]). - Dropped the unused numpy dependency and the dead offline_renderer import; added get_board_str() for the board-observation wrappers. Registered as RetroSpaceDuel-v0. Game mechanics (movement, shooting with boundary/asteroid ricochet, mines, debris, nebulas, power-ups, spread shot) are unchanged from the original submission.
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Revives RetroSpaceDuel, originally proposed by @romirthedev in #92. That PR targeted an older State/observation API and no longer imports against current
main, and the author is no longer active, so this ports it forward and verifies it end-to-end.What this is
A two-player competitive space shooter on an emoji grid: move in 8 directions, shoot (
f <dir>), with asteroids (indestructible, ricochet), debris (destructible), nebulas (slow movement, projectiles pass through), mines, and power-ups (shield / speed / spread-shot). Win by eliminating the opponent; at the turn limit the higher-health player wins (draw on a tie). Registered asRetroSpaceDuel-v0.Changes vs. the original submission (API port only — mechanics unchanged)
reset()asTwoPlayerState;reset(num_players, seed)signature.ObservationType; invalid moves useset_invalid_move(reason=).set_winner(); turn-limit resolution viacheck_turn_limit().ActionFormattingWrapper(e.g.[f w]), so it works under the default wrappers.numpydependency and the deadoffline_rendererimport; addedget_board_str().Verification
ta.make("RetroSpaceDuel-v0")→ reset / observation / step all work; no placeholder leaks in the prompt.Design note for reviewers
The original (intentional) mechanic is preserved: a shot that reaches a boundary or asteroid ricochets back and eliminates the shooter, so firing without a target lined up is self-destructive. The prompt warns about this. Under a purely random policy this ends games very fast; a policy that reads the rules avoids blind shots. Happy to adjust (e.g. reflect instead of eliminate) if maintainers prefer a softer rule.
Closes #92 if you'd rather track it here; otherwise feel free to keep #92 open and land this instead.