Cardoku Quest Rules

Place playing cards into a 4x4 puzzle grid while random Sudoku-style rules test every move.

1. Use the revealed cards and active rules to deduce where each card belongs.
2. Select or drag a hand card into a board slot; illegal plays cost 1 life.
3. Tap an unlocked board card to return it to your hand and repair conflicts.
4. Fill all 16 slots and pass the rule check to clear the quest.