How to play
Deck is complete once pair removal leaves precisely four cards, one from each suit, as the terminal layout. The terminal check examines every relevant pile, cell, edge, room, and clue before awarding the result.
- Deck starts with its fixed information already marked and its editable spaces left for the player. Four columns repeatedly remove exposed pairs of the same suit until exactly one survivor of each suit remains. Restart reconstructs the same opening from the stored game ID, rules version, and seed.
- A move in Deck is accepted only while it preserves every already-visible requirement. Four columns repeatedly remove exposed pairs of the same suit until exactly one survivor of each suit remains. Failed validation leaves the move count, history, and board exactly as they were.
- Deck is complete once pair removal leaves precisely four cards, one from each suit, as the terminal layout. The terminal check examines every relevant pile, cell, edge, room, and clue before awarding the result.