SpongeBob SquarePants: Battle for Bikini Bottom/Robots

In the concept art, you can see that a Robo-Squidward was originally planned to be in the game, possibly as a secret boss. This was scrapped before the game's release. But in the Game Boy Advance version, a Robo Squidward is present.

Also in the GBA version, King Jellyfish, Prawn, the Flying Dutchman, and Robo-Plankton are not present. Robo-Squidward is the penultimate boss, and Robo-SpongeBob is the last boss.