When cutscene is played, don't do anything or the cutscene might turn out bad. W - Jump A - Run Left D - Run Right Space/Double Space - Jump/Homing Attack Objective: Hit the thorax of the Beetle when the green circle shows up at the right time 5 times to destroy it!
CUTSCENE ADDED! NEW BOSS ATTACK(S) ADDED! So apparently you can Combo him if you spam Space. That's really the only way to get A rank I think. Boss from the game: Sonic Unleashed. Sprites from the internet.