The biggest issue with multiplayer: Rewind Plates.

[Own]

It seems like the first time anyone encounters them in multiplayer they spend at least a minute flailing around, trying to figure out how to rewind the puzzle until everyone accidentally steps on the plate at the same time. Up until then they assume the game has bugged out.

It might be helpful to put some sort of bubble above the plate when someone steps on it in multiplayer mode, like [1/# Players].

 

[MrChocodemon]

Can 4 people fit on the plate? What about a force field kind of thing where no player can enter or shove if someone is on the plate already?

 

[Teddy]

I've added a "Gather your friends"-popup to the rewind plates! They do indeed confuse people a lot (understandably).