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🏗️ Tower Stacker
Everyone stacks their own tower and the tallest wins. Nobody interferes with anyone — your opponent is your own hand, and a block left on the edge charges interest on the floors above it.
- Up to 4 players
- Party game
- In your browser, free
- With friends or against bots
Everyone plays at once, each on their own board
A block travels back and forth above your tower; you drop it and it settles. Land it crooked and the overhang is cut away, so the next block is narrower. Tallest tower wins.
Nobody interferes with anyone else's game. You can follow the others on the side scoreboard and, by clicking someone's name, watch their tower instead of your own. When you die, the screen of someone still alive takes over automatically.
The balance rule
The tower does not fall from accumulated 'error'. It falls by centre of mass: at every joint, the weight of everything above has to land inside the contact area between the two floors. Step outside it and that joint gives way — and only what is above it topples.
That is what makes one badly offset block fall immediately, while two slightly offset blocks — each acceptable on its own — bring the tower down together. And it is also what lets you recover: playing to the opposite side brings the centre of mass back.
Why height charges interest
Centre of mass alone would not be enough. Stacking perfectly straight on top of a block that is already at the edge does not move the centre of mass, so by pure statics you could hang half a block over the ledge and climb forever.
So every floor above a joint eats a little of that joint's margin. A tall stack amplifies lean. A straight tower has its centre of mass in the middle of the support and is effectively immortal at any height — the charge only reaches players who are already crooked.
The warning before the fall
A comfortable landing settles with a short, dry drop. A landing at the limit falls from higher, and the tower leans a few degrees and stays there, trembling. That lean is the warning: from then on, the next block decides whether you straighten up or lose everything above the weak point.
The two modes
- Cut — whatever overhangs the floor below is sliced off and the area shrinks. This is the precision mode: a mistake never topples you, it only narrows you.
- Physics — the tower can genuinely fall, by the centre-of-mass rule above. This is the mode where height is risk.
Controls
- Computer: Space to drop the block.
- Phone: tap anywhere in the arena.
The tower never moves horizontally: the base stays planted where it was born and the block in the air is the only thing that travels. There is no camera to follow — what you see is where the piece will land.
Against the bot
The bot aims for alignment by pulling half of the current drift back toward the centre of the base, with an execution error that grows with height. It is that accumulated error that eventually topples it — by the same centre-of-mass rule that applies to you. Its block genuinely travels on screen, so what fell really was what was passing by.
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