Left hand, right hand, one very nervous plank

You have two hands in StackUp now. Left mouse button is your left hand, right mouse button is your right, and on a pad they sit on the two triggers where a grip belongs. Nothing has to be held down. Click once to take something, click again to let it go.

The part that changes how the game plays is where the hand lands. It grabs the block at the exact spot you were looking at. Aim at the middle of a plank and you carry it like a waiter with a tray. Aim at the far end and you carry it like someone who has never carried a plank, because now it is a lever, and gravity has opinions about levers.

Then you can put your other hand on the same block. This is the part we did not expect to enjoy so much. Two hands at two different spots hold a plank steady in a way one hand simply cannot, and steady is the difference between adding a row and starting a landslide. Let go with one hand while walking and the whole thing swings down around the grip that is left, which is exactly as funny as it sounds and exactly as expensive.

The tower does not care about any of this. It stands there being 54 blocks tall, waiting.