Sonic Mania Plus: Mania Mode Part 7: Hydrocity Zone (Super Knuckles)
Knuckles actually had used a water machine, before. You had to fight him underwater while he was in one as the boss of Tidal Plant in Sonic Triple Trouble.
Once again, Hydrocity's Act 2 endgame got upgraded in Plus. After beating the first half of the Act 2 Eggman boss in the original version, you would be sent upward than out the top to face a new version of the original Hydrocity's Act 1 boss. Plus speeds this transitioning up by having you crash through a pipe instead, just in the off-case that you almost drowned.
Plus also added a new outro for Hydrocity Act 2, where water crashes and splashes in from the right, leaving a hole open for Sonic and/or his friends to escape from into Mirage Saloon (somehow...)
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