Zazz is the first boss of Sonic Lost World, serving as the recurring boss of Windy Hill.
Zazz is first encountered in Windy Hill Zone 3, where he will show up at random intervals throughout the Zone and repeatedly toss his Moon Mech at Sonic, who must dodge the Moon Mech until the pink Zeti gets fed up and leaves.
He is then properly fought in Windy Hill's boss stage, taking place on a 3D planetoid set at night. Zazz will ride atop his Moon Mech and will chase after the player for a short time before crashing the Moon Mech down in a slam attack that can potentially crush the player and shoot out stars. Crashing down the Moon Mech will make Zazz lose his balance, allowing the player to hit him with a Homing Attack to ground the crazed Zeti and stun him. At this point, the player can then whale on him with a series of Homing Attacks to inflict damage on him before he comes to his senses and gets back on his Moon Mech. The player must then repeat the process until his health bar is completely drained.
This battle is repeated in Lava Mountain Zone 1, preceding the battle with Zomom. In this rematch, Zazz has more health and has a new attack when he is on his last hit point, where he'll roll the Moon Mech around and try to run over Sonic. When he comes to a stop, Sonic can finish him off with a Homing Attack. The Red Burst Color Power also appears for this fight, allowing the player to deal even more damage to Zazz.