Archive · Zip #2

Zip #2 (September 27, 2026): solution and route

The 8×8 Hard puzzle from Sunday, September 27, 2026. Play it first; the route and the solved path are folded below. Replays don't affect your streak.

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Zip #2 was the 8×8 hard board of Sunday, September 27, 2026: 12 numbered dots, 6 walls, and one path that visits all 64 cells in order. Our solver, a line-for-line port of the app's, needed 2,650 search nodes to prove the path unique, which puts the board at 5 of 5 on the difficulty scale. Along the answer, 57% of the moves had only one legal continuation; the other 27 steps offered a real choice, and those are where you have to look ahead. The path turns at 55% of its cells, and its longest straight run is 6 cells. The longest leg, between two consecutive dots, is 12 cells.

Zip #2 in numbers

Board8×8, Hard
Numbered dots12
Walls6
Cells on the path64
Solver search nodes2,650 (5/5)
Moves with a single legal continuation57%
Decision points27
Turns along the path55%
Zip #2 route, dot by dot

How many cells each leg takes and which way it runs, reading from dot 1. “Right 3” means three steps to the right.

LegCellsDirections
1 → 211down 1, left 1, up 1, left 1, down 1, left 1, up 2, right 2, up 1
2 → 33left 2, up 1
3 → 47up 1, right 1, down 1, right 3, down 1
4 → 54left 1, down 1, right 1, down 1
5 → 612down 1, right 3, up 1, left 2, up 5
6 → 75right 1, down 4
7 → 84right 1, up 3
8 → 95up 2, left 3
9 → 106down 2, left 1, up 2, left 1
10 → 115left 2, down 1, right 2
11 → 121down 1

Where the choices are: step 1 at row 7, column 4 (3 ways), step 2 at row 8, column 4 (2 ways), step 3 at row 8, column 3 (2 ways), step 5 at row 7, column 2 (3 ways), step 9 at row 6, column 1 (2 ways) and step 10 at row 6, column 2 (2 ways) and 21 more. Everywhere else only one move keeps the board solvable.

Zip #2 solution

The number in each cell is its position on the path; the dots keep their own numbers and are highlighted.

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