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Archive · Zip #1

Zip #1 (September 26, 2026): solution and route

The 8×8 Hard puzzle from Saturday, September 26, 2026. Play it first; the route and the solved path are folded below. Replays don't affect your streak.

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Zip #1 was the 8×8 hard board of Saturday, September 26, 2026: 13 numbered dots, 5 walls, and one path that visits all 64 cells in order. Our solver, a line-for-line port of the app's, needed 3,106 search nodes to prove the path unique, which puts the board at 5 of 5 on the difficulty scale. Along the answer, 51% of the moves had only one legal continuation; the other 31 steps offered a real choice, and those are where you have to look ahead. The path turns at 56% of its cells, and its longest straight run is 6 cells. The longest leg, between two consecutive dots, is 22 cells.

Zip #1 in numbers

Board8×8, Hard
Numbered dots13
Walls5
Cells on the path64
Solver search nodes3,106 (5/5)
Moves with a single legal continuation51%
Decision points31
Turns along the path56%
Zip #1 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 → 21right 1
2 → 32right 1, up 1
3 → 41left 1
4 → 55left 2, down 2, right 1
5 → 62right 2
6 → 72right 1, up 1
7 → 86up 1, right 1, down 3, left 1
8 → 95left 4, down 1
9 → 103right 3
10 → 1122right 1, down 1, left 4, down 2, right 1, up 1, right 1, down 1, right 1, up 1, right 1, down 1, right 3, up 1, left 2
11 → 129up 2, right 1, down 1, right 1, up 2, left 1, up 1
12 → 135right 1, up 2, left 1, down 1

Where the choices are: step 1 at row 2, column 2 (3 ways), step 2 at row 2, column 3 (2 ways), step 4 at row 1, column 4 (2 ways), step 9 at row 3, column 1 (2 ways), step 10 at row 3, column 2 (2 ways) and step 11 at row 3, column 3 (2 ways) and 25 more. Everywhere else only one move keeps the board solvable.

Zip #1 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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