In the Battle for Bikini Bottom version, after getting 40 Golden Spatulas you face him. He is first seen trying to hit Squidward with his ice-cream shaped piece of metal (composed of crunching toxic waste barrels together; the toxic cream is presumably ooze from the compression of the barrels), then spitting industrial waste. Robo-Patrick then freezes Squidward into a block of ice. It is up to SpongeBob and Sandy to defeat him.
In SpongeBob's Truth or Square version, SpongeBob upsets Patrick by calling him tubby, so he runs away. Just then, Robo-Patrick shows up and tries to hurt him. Robo-Patrick tries to slip him with mud, stab him with sharp pins and sink him in green goo. After SpongeBob defeats him, he lowers his head and hovers away. However, in the console versions, as SpongeBob talks with Patrick, Robo-Patrick explodes.
Squidward: (Screaming) [Robo-Patrick tries to smash Squidward and then freezes him] Sandy: Wow! That robot looks like Patrick! And it's breath smells just as bad. SpongeBob: This day just doesn't seem to be getting any better. Sandy: SpongeBob, Hurry! Squidward's in more trouble than a chili reano and a pan of grease! We have to help! SpongeBob: You're right, Sandy! But if that robot really is like Patrick, he'll eat us for dessert! What should we do? [Robo-Patrick licks the ice cream made of sludge] Sandy: Well, we better figure something out, and pronto! SpongeBob: Maybe that button on his back is a self-destruct! I'll try to hit it. Sandy: Good idea, SpongeBob, but it's time to stop yapping and get to it!
Robo-Patrick: (Belches) [SpongeBob is scared but yelps in victory and tries to help Squidward; Robo-Patrick wakes up and he freezes SpongeBob too] Sandy: That does it! You pushed this squirrel too far! Get ready for a hot fudge twister, Texas style.
Sandy: [Robo-Patrick pulls the switch and it breaks] Yoo-hoo! That's hotter that a June bug in July! [The hot sludge rises, freeing SpongeBob and Squidward from the ice] SpongeBob: [He gets the bubble bowl out as Sandy is treating Squidward's injuries] It's time to roll out some robot punishment!
Robo-Patrick: (Screams) [He explodes] Squidward: Thanks for saving me, guys! I never thought I'd say this, SpongeBob, but I owe you big time. SpongeBob: Thank Sandy. We'd still be popsicles if it wasn't for her. Sandy: Aw, shucks. You fellers are gonna make me blush. SpongeBob: .... I think I have fudge in my pants.
The arena is in the form of a square shaped drainage den (by three levels) with a central platform placed near locked doors, as well as surrounded by a set of conveyor belts (with underwear) and some floating rocket platforms. The whole arena is locked inside a big toxic pool that makes the battle impossible to escape (or Sandy to be safely exposed to liquid for that matter). Squidward will be frozen on the right side of the arena when the battle starts (alongside SpongeBob on the second) and does not affect the battle in anyway (he cannot be used to shield against attacks).
At the first phase, the Robo-Patrick will pound his cone into the ground, which can be dodged easily by staying far from him. After his spit attack, the robot will perform his spinning attack. The player must not get hit or the robot will taunt. After avoiding the whole attack, the robot will become stunned and dizzy from the reckless spinning, and will be left open to any attack on his rear (Bubble Spin, Bubble Bowl, Cruise Bubble, Karate Chop and Karate Kick only). After getting hit via this method two more times, the second phase starts.
As SpongeBob is frozen after trying to save Squidward, Sandy takes over for the battle, and thus, the Texas hooks can now be used. However, the robot ditches its first initial attack, and after getting hit, Robo-Patrick will rush to the center of the drainage den and jump up to pull a lever that unleashes a wad of toxic waste from a large tanker suspended above the whole arena. The robot will drink from the toxic while doing so as well, and thus after it drops back down, it will belch out an array of toxic at her and Sandy will have to move fast (preferably with the swinging hooks) to avoid the attack. Due to the toxic waste taking up one level of the drainage den, Sandy cannot attack it without risk of getting hurt by the toxic, and thus after it gets itself dizzy as usual, Sandy must pull on the swing hooks to release crates for her to jump on to safely damage the robot's back. The robot will then pull the tanker's lever again (raising the waste up to level 2), and will perform its belch attack again. Note that the crates will be destroyed whenever they come into contact with the robot (either from the spin or by a crate falling on the robot).
The third phase then has the robot beforehand raise the whole waste level to the whole arena (barring the large central platform, the two rocket platforms and the coveyor belts), thus limiting movements. Squidward is freed and SpongeBob re-enters the fight. If the 3rd phase is progressed to normally, the belch attack as usual is performed, but if the 3rd phase is restarted via a death, then it will not happen. The robot then adds the ice breath attack to its arsenal, so SpongeBob must take care not to get hit by it (he can be exposed to the spit, or either the toxic waste flood if he happens to be frozen in midair and right above it). The robot will then always be left dizzy by a conveyor belt, which is SpongeBob's cue to hit it with a Bubble Bowl (or a Cruise Bubble if this battle is being replayed). After the robot is defeated, the Cruise Bubble is rewarded to SpongeBob's moveset.
In the GBA version, the Robo-Patrick will try to strike SpongeBob with its net while chasing him all over Jellyfish Fields. Like with all the robot bosses (save for the first one which is Robo-Sandy), SpongeBob rides on Mystery, and must not get off of her. The objective is to flee the robot while swallowing bomb robots on the way with Mystery, then spit them back at the robot to damage it (they must not be missed or otherwise a dead end will be reached). Touching the robot will mean instant death, thus SpongeBob must not slack.
Robo-Patrick has little difference in body shape from the real Patrick. His shorts are black with red skulls where the purple flowers should be. There are two antennae sticking out of both sides of his head. On his back is a "Kick Me Here!" sign. He has small wheels on his feet. What's more, the robot also has a possibly "taller" head, and sports fangs.
In the GBA version, the robot's shorts are the same as the console version, but the colors are inverted to the normal Patrick's scheme (only the skulls are still red). The robot also has red glass eyes with white blank "pupils" and a large signal antenna (composed of a black rod with a think disc rim and a red lightbulb on the end) on the back of its head. It also has a large Jellyfishing net with a black shaft, and has no wheels (and thus walks and runs as normal).
In Truth or Square, he is much the same, except he has a belt, no skulls on his shorts, and he has a Cyclops eye and antenna like Plankton, his controller.
Spitting Industrial Waste: Robo Patrick will take of lick of its "toxic-cream", then split a bullet of toxic at his target with a splitting sound. Similar to some projectile attacks in the game, the projectile will always hit ahead at a certain area to intercept SpongeBob or Sandy if they happen to be moving, so learning to bait the attack is the key. It can also be safely jumped over at an assuring height. There is also a variation while the robot belches it out in a complete stream.
Ice Breath: Only in the third phase. The robot from right to left performs its ice breath to Refreeze SpongeBob, if it hits, SpongeBob will be frozen in place (even in midair) and will be open to anything that inflicts damage. Has a set range and can be jumped over. When SpongeBob is frozen, Patrick will hurt you with spit attack Only in the third phase of the battle.
Spinning, Releasing Waste: After all its moves are performed, the robot spins around the whole arena (the portion where it is kept in) while firing off random toxic projectiles. It is possible to be damaged by the robot (if the player is in the small den the robot is in) and either the projectiles, so caution should be taken to be able to avoid the attack, or the robot will taunt.
"Ice-Cream Cone" Hits: Smashes his ice cream cone on the floor to shoot multiple toxic projectiles forward. Has a short range and can be avoided by keeping distance. Only on the first phase of the battle.
After every hit by Sandy, Robo-Patrick raises the waste level where he stands.
Toxic Upchuck: In the 2nd phase, after taking a hit, Robo-Patrick will gag up a lot of toxic waste in the form of drops, and must be evaded or he will stop his attack and taunt, this can be easily avoided by swinging on the Texas Hooks.
His portrait is an altered version of the normal Patrick's artwork during his freak-out on Valentine's Day (the shirt is removed and ice cream cone is changed. The colors are altered to match the robot's scheme, as well as having green sclera). This full artwork can be seen on some of the hittable TV's in some buildings on the Bikini Bottom hub level.
In the GBA version, his eyes look like Murkrow's from Pokémon.
This robot is one of the few robots to actually speak (via some of its sound effects in battle and its scream at the end of the last phase, which sound uncanny to the real Patrick himself).