1 to 16

1 to 16, every number next to the next one.

A 4×4 board with a few numbers already in place. Fill in the rest so every number touches the next one along a side: 1 next to 2, 2 next to 3, and so on up to 16. On hard, 5×5 and 1 to 25.

You all get the same board, but each of you fills in your own: your rivals only see how many you've placed. Whoever finishes first wins. You can play 1 vs 1, with three or four players, in pairs (2 vs 2), against bots of four levels or in a private room with your friends.

How to play

You all get the same board, but each of you fills in your own.
Place the missing numbers so each one touches the next above, below, left or right (diagonals don't count). On hard, 1 to 25.
If a number doesn't go there, it doesn't stay and you can't play for 2 s. Your rivals only see how many you've placed.
Finishing gives 5 points, and the first to finish get a bonus (+3, +2, +1). If time runs out, you score up to 4 based on your progress.
In 2 vs 2, partners add up their points: red and yellow against blue and green.

Tips

Look for two given numbers with a single gap between them: the missing one goes there.
Corners only have two neighbours: few numbers fit there.
Tap a number to see where the previous and next ones are.

Frequently asked questions

Do diagonals count?

No: each number has to touch the next one above, below, left or right.

Does it have a single solution?

Yes, always.

What happens if I get one wrong?

The number doesn't stay and you can't play for 2 seconds.

Play 1 to 16 for free

1 to 16

How to play

Tips

Frequently asked questions

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