Clever Keys

From BoardGameGeek:

There's treasure in the old castle! Players take turns inserting keys into the game board. If the keys are inserted in the right slot, they unlock the secret chamber and reveal valuable gemstones. Every additional move either lets the player get richer – or lose everything. The player who collects the most gemstones wins. This push-your-luck memory game uses a unique box and board construction to provide hundreds of combinations for the "locked" areas of the board. -description from publisher