Tower Builder
In Tower Builder you stack blocks on an eight-column grid. Every square of a block must be supported from below. Free, no install, no sign-up.
In Tower Builder, you have a fixed number of blocks and a grid eight squares wide. Every square of a block must be held up from underneath — nothing may float. Build as high as you can.
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Works offline after the first visit. No install, no sign-up.
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How to play Tower Builder
One rule decides everything
When you place a block, every one of its squares must have something directly underneath it: either the ground, or a block you already placed. If even a single square would be left hanging in the air, the whole block is refused. This is not a stiffness check or a balance check — it is exact, square by square, and it is the entire puzzle.
The width is given to you
Each block is one, two or three squares wide, and the game decides which. You only choose where it goes. That is deliberate: if you could pick the width, every position would be solvable and there would be nothing to work out.
Nothing can be moved once placed
There is no undo and no dragging blocks around. A tower that ends up top-heavy or lumpy stays that way, and the run is spent. Think before you tap.
The view follows the top of your tower
As the tower grows the board scrolls upwards so the top is always on screen. You will never be stacking blind — the view only starts moving once the tower is tall enough to need it, so a short tower sits still on the ground rather than floating.
Running out of blocks ends the round
The number of blocks is fixed and shown on screen. When the last one is placed the round is over and the height of the tower is your result.
The height readings go up the side
Every fifth row is labelled, so you can tell at a glance how tall you have got and how much higher you still need to go.
Tower Builder Tips and Strategy
Every cell needs a block under it
A piece only lands if each of its cells has a block directly below it or is on the ground row. One overhanging cell is enough to reject the whole piece, even if the rest is well supported. Read the piece as a row of separate columns rather than one shape, because the rule is checked column by column.
Width one is your safety net
The piece width is chosen for you, between one and three cells, and a single-cell piece only ever needs one support underneath. Narrow pieces are the only way to fill a gap or to raise the top of a tower without committing a wide placement. When a wide piece has nowhere legal to go, you are usually waiting on the width to change.
Build a flat top early
You get 18 pieces and the score is the height of the highest block, so spreading pieces across all eight columns early costs height for no benefit. A wide base gives you more supported surface to build on later. Once you have gone tall on a narrow column, the only way up is to fill in the columns beside it, and that is slow.
Tower Builder — Frequently Asked Questions
Why will my block not go where I tapped?
Because at least one of its squares would have nothing underneath. Blocks must be fully supported, square by square — a two-square block sitting half on the tower and half over empty space is refused, even though it looks like it would balance.
Can I take a block back?
No. Placement is final, so it is worth looking before you tap.
Can I choose a narrower block?
No, the width is given. Every block is one, two or three squares wide and the game decides. Choosing the width yourself would make every position workable and remove the puzzle.
The board moved while I was playing.
That is the view following your tower upwards so the top stays visible. It only starts moving once the tower is tall enough, so a short tower stays put.
Does it need installing or an account?
No. It runs in the browser on a phone, tablet or computer and works offline after the first visit.