Crystal A5 S.E.C.R.E.T (Secret Enforcer of the Crystalline REactor Tyrant) is the first mission of Project Crystal P5, not counting the bonus two missions. It has 50 rounds, and the mini-boss is the Crystal Bloon, and the boss is the Code Crystal Destroyer. It takes place on the Crystal Mountain. The mission is unlocked by a secret, and has few secret suprises and random secret facts, and also has a secret boss, the Crystal CSX900 Tyrant!