Rotatatron

Rotatatron is the name given to a giant robot fought at the end of Tropical Resort in the Wii version of Sonic Colors. (Eggman also calls it the Big Boy.) This boss appears again on Planet Wisp but with the name Refreshinator. After Sonic discovers Eggman is capturing Wisps for his own evil deeds, Eggman leashes the Rotatatron to stop Sonic but is ultimatly destroyed. When destroyed, a part of his arm becomes lodged in a part of Dr. Eggman's Incredible Interstellar Amusement Park, and later, the piece causes Eggman's giant mind control cannon to backfire. This boss fight is rather simple, as he only takes three hits to defeat and attacks by clamping his hands on the arena. His weak point of his giant, yellow eye located at the center off his body, which can only be hit by a Homing Attack, when the eye is full open. After that is hit three times, the robot is destroyed and the player is graded. One platform has a capsule containing a cyan wisp which can be used to attack either his eye or his arms to deal double damage.

Video(s)
Video:Sonic Colors - S Rank - (Boss) Tropical Resort|Sonic Colors - Rotatatron Boss Fight

Triva

 * Rotatatron is the name of the boss according to the Sonic Colors Prima Guide. In-game, however, Eggman calls it his "Big Boy."