Twofold

A number merge puzzle: place each tile anywhere on a 5×5 board, and touching equal tiles join into one double. Can you build 1024?

Puzzle game
Free
No sign-up
Keyboard
Touch

Score0

Best–

Best tile–

Place2

Next2

Arriving now: 2 to 16
Goal: a 1024 tile

Click an empty cell, or move with the arrow keys and press Enter. U undoes once per game.Tap an empty cell to place the tile. Two equal tiles that touch merge into one double.

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About Twofold

Twofold is a number merge puzzle where you decide where every tile goes. Each turn you get one tile, a 2, 4, 8 or bigger, and place it on any empty cell of a 5×5 board. When it touches a tile of the same value, the two join into one tile worth double.

Merges can chain: two 8s make a 16, which joins a neighbouring 16 to make 32, and so on. Keep building towards a 1024 tile before the board fills up. There is no sliding and no timer, so every move is yours to plan.

How to play Twofold

Look at the tile marked Place, and the Next tile after it.
Click or tap an empty cell to put the tile there.
If it touches an equal tile above, below, left or right, they merge into one tile of double the value on the cell you chose. That tile can merge again straight away.
Keep going until you build 1024, then carry on for a bigger tile and a higher score. The game ends when every cell is full.

Twofold controls

Keyboard
Choose a cell	Arrow keys (Tab reaches the board)
Place the tile	Enter or Space, or click the cell
Undo the last move	U (once per game)
New game	N
Sound on or off	M

Touch screens
Place the tile	Tap an empty cell
Undo or new game	Tap the buttons above the board

Twofold rules

Merging

Tiles touch when they share a side; corners do not count. When the tile you place touches one or more tiles of the same value, the whole touching group becomes one tile of double the value, on the cell you placed on. Three 8s in a group still make a single 16, so a group of more than two wastes tiles.

After a merge, the new tile checks its own neighbours and merges again if it can, so one placement can climb several steps. Because of this, two equal tiles never stay side by side.

Which tiles arrive

Arriving tiles depend on your best tile. The smallest is your best tile divided by 16, but never less than 2; the others are 2, 4 and 8 times that. So you start with 2, 4, 8 and 16, and once your best tile reaches 64 the smallest arrival becomes 4. The chances are 45%, 30%, 15%, 10% from smallest to largest. The range arriving now is shown above the board.

Small tiles left on the board after the range moves up can still merge with each other, but no new tiles of that size will come. Clear them while you can.

Score, undo and records

Every merge scores the value of the tile it makes, so a chain scores each step. You get one undo per game. Your game in progress is saved in this browser, so you can leave and come back. Your best score, best tile, games played and games that reached 1024 are saved on this device.

Tips and strategy

Keep your biggest tile in a corner or along an edge, and build the next value down beside it so merges can run along the line.
Place a tile where its merge result will also touch its equal: a 16 next to a pair that makes 16 turns into 32 in one move.
Leave room. Each merge frees a cell, but a tile that cannot merge takes one for good, so think about where a tile will be useful later.
Watch the Next tile. If the next one matches something on the board, keep a cell free beside it.
Save your undo for a real mistake, like a tile dropped in the one cell you needed.

Frequently asked questions

Is Twofold like other number merge games?

It belongs to the same family of puzzles about doubling numbers, but you never slide the board. You place each tile exactly where you want it, so the game is about planning space rather than predicting how tiles move.

Is it possible to reach 1024?

Yes. In our tests, a simple computer player that only looks one move ahead reaches 1024 in about half of its games, in around 110 moves. Planning a few moves ahead does better.

What happens when the board is full?

The game ends, because a tile can only go on an empty cell, and you see your score and best tile. Start a new game to try again.