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This is called Hidato or Snake Puzzle !

The goal of Hidato is to fill the grid with consecutive numbers that connect horizontally, vertically, or diagonally. For your help, the grid is already filled with a few numbers.

enter image description here

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  • $\begingroup$ What do you mean by "connect"? $\endgroup$
    – Wais Kamal
    Apr 11, 2020 at 15:42
  • $\begingroup$ The previous number and the next number must appear in the 9 boxes surrounding a number $\endgroup$
    – perayu
    Apr 11, 2020 at 15:45
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    $\begingroup$ Is there any rule about the consecutive-numbers path crossing itself? If not, it seems solutions must be non-unique. Look at the 129 and 132 on the right: some logic may determine whether 130 and 131 are above or below those two, but how do we know which way round the 130 and 131 are? Seems like, given that they're say above the given two, 130 and 131 could be swapped around without affecting anything else in the puzzle. $\endgroup$ Apr 11, 2020 at 16:20

2 Answers 2

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Here's a solution:


enter image description here

The snake does cross itself, though. It isn't mentioned in the OP if this is allowed or not.

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  • $\begingroup$ There is a crossing between 7-8 and 17-18 and between 135-136 and 149-150. $\endgroup$
    – Florian F
    Nov 17, 2023 at 20:08
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Another solution, nicer in my opinion...

enter image description here

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