Unity Grid Puzzle Effects

Use unity-cli and unity-game-dev for the project's operating contract. Inspect its board predicates, commands, effect schema and tests. Read the composition recipe before adding a module. Use unity-grid-drag-puzzle only when building or changing its movement system.

Define support and behavior

Separate authored validity, registered modules and runtime support. A schema entry or editor icon does not prove that a mechanic is playable. The source recipe demonstrates Arrow and Ice behavior; Barrier is an extension design whose runtime support must be implemented and verified before it is enabled. Reject unsupported playback explicitly.