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cambridge/docs/rulesets.md

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Rulesets

A ruleset is a set of rules that apply to any game mode.

A ruleset consists of the following things:

  • A rotation system, which defines how pieces move and rotate.
  • A lock delay reset system, which defines how pieces lock when they can no longer move or rotate.

If you're used to Nullpomino, you may notice a few things missing from that definition. For example, piece previews, hold queues, and randomizers have been moved to being game-specific rules, rather than rules that are changeable with the ruleset you use. Soft and hard drop behaviour is also game-specific now, so that times can be more plausibly compared across rulesets.

There are six rulesets currently supported:

  • Cambridge - a ruleset original to Cambridge, used for all custom modes. Supports 180-degree rotations!

  • SRS - the rotation system used in the Tetris Guideline games. Supports 180-degree rotations!

  • Ti-SRS - SRS but with no 180-degree rotations.

  • ARS - the rotation system from the original Tetris the Grand Master.

  • Ti-ARS - ARS with floorkicks! From TGM3: Terror Instinct.

  • Ace-ARS - ARS with floorkicks and move reset! From TGM ACE.