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
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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.
