Crunch first appeared as a boss in Crash Bandicoot: The Wrath of Cortex (where he is fought five times). He was forced to reprise this role in Crash Bandicoot: N-Tranced and Crash: Mind over Mutant due to mind control, making him the only boss to be fought over and over again.
Crash Bandicoot: The Wrath of Cortex
Crunch & Rok-Ko:
Main article: Rumble in the Roks
Crunch is the first boss and has three hit points. He'll be fought while Crash is in the Atlasphere. Rok-Ko will make a ball of rocks surround him before the fight starts and rocks come into the arena. Crash must bump into all of these rocks to make them fly up and hit Crunch. Repeat this strategy two more times and Crash will win. Crunch will attempt to ram Crash in this fight, causing Crash to lose health. Crunch can also set rocks on fire which will also hurt Crash on contact.
Crunch & Wa-Wa:
Main article: Drain Damage
To unlock the second boss, collect five Crystals in the Water Warp Room:
Crunch is the second boss and has four hit ponts. Crunch will be in a swampy environment where he's made out of water by means of Wa-Wa. Crunch will be shooting rays at Crash, so Crash needs to hop across three platforms while avoiding the attacks and spin Crunch. Repeat this strategy three more times and Crash wins.
Crunch & Py-Ro:
Main article: Crashes to Ashes
The third boss is unlocked by collecting five Crystals in the Fire Warp Room:
Crunch has three hit points and chases Crash while shooting fire balls at him. Crash must get to a water-spraying mech, where he must then chase Crunch and spay him with water. Repeat this strategy two more times and Crash wins.
Crunch & Lo-Lo:
Main article: Atmospheric Pressure
The fourth boss is unlocked by collecting five Crystals from the Air Warp Room:
In this fight, Crash will be in a canyon with Crunch (in air form) launching rays and energy balls at him. Crash must avoid his attacks and shoot Crunch with his biplane's machine guns. Do this strategy until Crunch's health bar runs out, then Crash wins.
Dr. Cortex, Crunch & The Elementals:
Main article: Crunch Time
To unlock this boss, Crash needs five Crystals from the Space Warp Room:
To avoid most of the Elemental attacks, jump on one of the 2 platforms in front of Dr. Cortex. Crash can avoid all attacks except from the flaming rocks that fall down. To defeat him, Crash must dodge all attacks until Crunch gets tired. When he does, Crash must shoot him with his bazooka. Crunch will jump to the center behind Cortex and kick him off the platform. Spin Cortex and Uka Uka will carry him back up to the platform. It will be the same each round, but Crunch will introduce a new Elemental each time. On the last round, he will switch between all of them. Repeat the strategy of shooting Crunch and spinning Cortex four times to win.
Crunch is the first boss in Crash Bandicoot 2: N-Tranced after being hypnotized by N. Trance. He is fought in Arabia. In his boss fight he wears a suit and a jet pack. He is armed with a gun and a shield. Crash must shoot at him after he hits a nitro crate and lowers his shield. After three times, Crunch will be defeated.
Crunch is fought in the junkyard and has 9 hit points. He will be under control of the NV and Crash will have control of TK. He will be controlling five missile shooting robots, so Crash needs to lift TNT Crates off of a conveyor belt, and throw them at the robots. When the front is open, throw the TNT Crates at four more robots. Then, two mechanical arms come out of the wall and walls in front of Crunch in various spots. He will be running behind them and coming out to throw bombs, so Crash will need to use TK to throw him at two grinders, making him lose a hit point. Crash needs do this three more times. Then, Crunch will become jackable and Doom Monkeys will be flying at Crash. Now, Crash needs to use Crunch's missiles to hit N. Brio, who is running around in a glass room. Once he is hit, Crash wins.