Feedwater's wiring system has a new switch type: "clicky" wall buttons. Unlike floor buttons, which require a constant weight on them to be activated, wall buttons can be toggled by simply pressing them. Walk away and they stay on or off like a light switch.

There's another twist. Wall buttons can also be turned on by arrows and nearby dynamite explosions, allowing for remote activation.

You can try this feature in the new tutorial level Switches III. I might move some of its more complex puzzles into a challenge level in a future update, but for now it's a fairly comprehensive walkthrough of the new mechanic.