Hydroid can glitch through almost every wall.

[Snowrush212]

Hello,

I found a bug with Hydroid and his third ability. If you go into your puddle while standing against a wall, then look behind you but still walk against the wall you want to go through and then roll out of the puddle, you will eventually fall through the wall you were standing against.

Hope this is helpful,

Snowrush212

[Wolfsong_The_Jester330]

They patched it.
Congratulations, Hydroid is useless once more.