Fitter,[4] known as Round-Up in the Americas,[2] is a maze-strategy arcade video game released by Taito in 1981.

[1] Another Japanese company, Hiraoka, licensed a version called Round-Up to Centuri for release in the Americas in December 1981.

[3] The object of the game is for the player to maneuver a white robot within a maze, capture a red character robot as they move about the maze, and race to the center to change the 9 white balls located there to red.

Bonus point may be earned when capturing the elusive 'red king' that appears on the screen.

If the player is successful in changing all of the balls in the center to red, the pattern clears and then a new challenge is presented: a 3×3 or 4×4 tri-colored pattern will appear at the bottom of the screen and a slightly different tri-colored cube of corresponding size will appear at the center of the screen.