The Location

Grunty's Submarine Challenge is located in Davy Jones' Locker area. While Banjo and Kazooie have been transformed into the Submarine, enter into the Deep Sea Cavern that has too much pressure for Banjo and Kazooie to enter regularly.

The Rules

The rules for Grunty's Submarine Challenge are simple: shoot the Shrapnels using the Submarine's torpedoes and earn 60 points in 60 seconds. Red Shrapnels are worth one point, Green Shrapnels are worth two points, and Blue Shrapnels are worth three points.
Colorful Shrapnel

The red, green, and blue Shrapnel.

The Prize

The prize for completing the challenge is a Jiggy.

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