Power Star

Power Stars are items in Super Mario 64 that Bowser has stolen from Princess Peach's Castle by onknown means. To face Bowser, Mario must gather the Power Stars in order to harmess their power(hence the name "Power" Star) to unlock doors that Bowser has sealed off in order to defeat him. There are 120 stars in the game, but only 70 are needed to defeat Bowser.