A TriIcelon is similar to the real-world triathlon. TriIcelons consist of three separate sporting styles in one game: running, sliding, and swimming. These three things combine to make a race where everyone competes for first place. The TriIcelons take place in four courses: Sweets, Jungle, Toys, and Horror.

The player controls little penguin-like characters called Pen Pen, in a race consisting of the three separate sporting styles. Both the sliding and swimming parts are raced by tapping and holding the action button in a rhythmic motion to maintain a smooth flowing pace. The running section is controlled simply with the analogue stick, also with the ability to jump, and charge into other competitors. The playable characters include the Pen Pens Sparky and Tina, the Pen Hippo Ballery, the Pen Shark Jaw, the Pen Walrus Back, the Pen Octopus Sneak, the Pen Dog Mr. Bow, and the unknown-species Hanamizu.