Grunty's Submarine Challenge

Grunty's Submarine Challenge is a mini-game within the Deep Sea Cavern of Jolly Roger's Lagoon in Banjo-Tooie. It can be played by entering a hole as Submarine Banjo (which is otherwise impossible to be accessed due to, according to Jamjars, the pressure of the water), and its objective is to destroy 60 points worth of Shrapnels in under 60 seconds in order to win a Jiggy from Gruntilda.