4096 Ring

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Best 0

Highest number 327 doublings to 4096

Tap a gap in the ring 2

8

4

4 / 16

4096

You built 4096

Score 0 · 0 moves

Numbers sit round the ring, and the piece in the middle goes into whichever gap you tap. Every few turns that piece is a +. Put a + between two twins and they fuse into their double. Then, while the two pieces either side of the new number are a matching pair, they fuse in too: the number doubles again, or becomes double the pair if the pair is bigger, so a + between the 2s of 64, 2, 2, 64 makes 128. Twins side by side never merge on their own, and a + between two different numbers waits there until its twins come along. The small piece beside the middle one is the next piece; you can swap the two at any time, and a new number is often a twin of one already on the ring. The ring holds 16 pieces, and a full ring only takes a piece that sets off a +. Build a 4096 to win.

Little arrows inside the ring point at every gap where the piece in the middle would set off a fusion. Tap the middle, or Swap, to swap the piece with the next one. Press on the ring and slide round it to open a gap, then let go to place the piece; slide into the middle to cancel. With a keyboard: ← → pick a gap, Space or Enter places, X swaps, Esc clears. U undoes a move, 3 per game. When your best number reaches 256, the 2s retire and new numbers start at 4; each doubling after that retires the next number. Your game, best score and record for the fewest moves to 4096 stay in this browser.

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