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Gravity Blocks is a free online gravity puzzle. You never push a block: you turn the whole board a quarter turn left or right, and gravity, which always points down the screen, slides every loose block as far as it can go. Walls stay where they are. Get each coloured block resting on the slot of its colour and the board is solved. Twelve boards in four chapters add a second and third colour, grey stones that belong nowhere but block and prop, and blocks bolted to stones that fall as one piece. Every board has a par found by computer search, with hints and unlimited undo. Plays in the browser on a phone or a computer, no download.
How to play Gravity Blocks
- Each board holds one or more coloured blocks and a dashed slot for each colour. Rest every coloured block on the slot of its colour to win.
- You never move a block by hand. Turn the whole board a quarter turn left or right with the Turn buttons, the left and right arrow keys, or a sideways swipe on the board.
- Gravity always points straight down the screen. After every turn, each loose block slides down as far as it can, until a wall, the edge of the board or another block stops it. Walls never move.
- Every turn moves every block at once, so on boards with several colours look for turns that bring them all home together. A block can sit on top of another and use it as a step.
- Grey stones belong on no slot. They fall like any block, and you can use them as a stop or a prop, or find them in your way.
- A block with a steel strap is bolted to a stone. The pair fall as one piece and stop as soon as either half meets something; only the coloured half needs to reach its slot.
- Every turn counts. Finish in par — the fewest turns possible — for three stars, within the two-star line for two, and any finish earns one. Hint shows the next turn of a best route, and Undo takes turns back.
Tips
- Turning the board right sends the blocks towards the side that was on the right; turning it left sends them towards the side that was on the left. Before each turn, ask where each block will stop.
- Two turns the same way flip the board upside down, so the blocks drop back across the whole board. Four turns the same way bring gravity back to where it started.
- A block stops against the first thing in its way. Look for the wall or block that will stop it exactly on its slot, and work out which way gravity must point for that.
- Work backwards: from the slot, which way did the block come in, and where must it have been resting a turn earlier?
- On boards with several blocks, one block often has to wait in a corner while the other gets into place. A turn that seems to do nothing for one block can be the move the other needs.
- Stones and bolted pieces block whole rows. Sometimes the best use of a stone is as a floor for a coloured block to land on.
- If you are stuck, ask for a Hint. When the board can no longer be won from where you are, it says how many turns to undo.
FAQ
Is Gravity Blocks free to play?
Yes. It runs in the browser with no download, no sign-up and nothing to buy. All twelve boards are included and unlock one after another as you finish them.
How does turning the board work?
Each turn rotates the whole board a quarter turn to the left or right. Gravity always points down the screen, so after a turn the side that is now at the bottom is where the blocks fall. Every loose block slides in that direction until a wall, the edge of the board or another block stops it. Walls are fixed to the board and turn with it.
What are the grey stones and the strapped blocks?
Grey stones have no slot. They fall like any block and are there to block, prop and get in the way; they first appear on board 7. From board 10, some coloured blocks are bolted to a stone with a steel strap: the pair move as one piece and stop as soon as either half hits something, and only the coloured half has to reach its slot.
Can I get stuck?
Not on the first five boards: every position there can still be solved. On later boards a block can fall into a spot it can never climb back out of. Nothing is lost: Undo takes turns back one at a time, and Hint says how many turns to undo.
Can I win just by turning the same way over and over?
No. Every board is checked so that spinning one way never solves it, and every board after the first needs at least two changes of direction. Every wall, stone and strap is there for a reason too: take any one away and the fewest turns needed changes.
How are par and the stars worked out?
A computer search tries every position a board can reach — which way gravity points and where every piece rests — and finds the fewest turns, so three stars are always possible. The two-star line is the median of 41 runs by a player who knows the way but slips on one turn in four, each slip costing at most two extra turns, raised if needed to a number of turns a board can actually be finished in. Any finish earns one star.
How many levels are there?
Twelve, in four chapters of three: one block, then two and three colours, then grey stones, then blocks bolted to stones. Boards grow from 5×5 to 7×7 and par from 3 turns to 14.
Does Gravity Blocks work on a phone?
Yes. Swipe left or right on the board, or tap the Turn buttons beneath it. The board is square, so it fits a phone held upright as well as a computer screen; you turn the board on screen, not the phone.