cambridge/docs/rulesets.md

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.

Rotation system

A rotation system defines the following things:

• The block offsets of each piece orientation.
• The wall or floor kicks that will be attempted for each type of rotation.

There are four rotation systems currently supported:

• Cambridge
• Classic ARS
• Ti-ARS
• SRS