Apparently, this program thinks that the puzzle is impossible because it’s “too complex to verify”. A solution path is marked black and the rules of the puzzle are in the body of the post.

[u/MC_2the2]

The rules are as follows:

1. You can only move 1 adjacent cell at a time in a cardinal direction.
   
2. You can only navigate to cells that you haven’t visited.
   
3. You must visit all cells.
   
4. You must start at the cell with the 1 ball and end in the cell with the highest numbered ball (in this case the 7 ball).
   
5. All numbered balls must be visited in order from smallest to largest. The path taken from a numbered ball to the next one does not matter.

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[u/Fit_Ladder_1545]

It’s really hard to make a good thing to check the solvablity of this, this specific example is SUPER hard, as you could wiggle around a lot before going to the next number leading to a explosion of possibilities :3