The Hardest LinkedIn Zip Puzzles Ever, Measured
We hold the full solved archive of every daily Zip: all 473 puzzles, from #1 (March 18, 2025) to #473 (July 3, 2026). We scored each one with a structural difficulty index (0 to 100) built from grid size, walls, path turns, and checkpoint density. The results: the hardest Zip ever is puzzle #210, and LinkedIn runs a hidden weekly difficulty schedule that peaks on Sunday.
LinkedIn's hidden weekly difficulty schedule
Like the NYT crossword, Zip ramps up through the week, and the mechanism is grid size. Across all 473 puzzles, LinkedIn has never published an 8×8 board on a Monday or a Tuesday. By Sunday, 33% of boards are 8×8 and median difficulty reaches 35, about 2.5× the midweek level.
| Day | Median difficulty | 8×8 boards | Puzzles |
|---|---|---|---|
| Monday | 22 | 0% | 67 |
| Tuesday | 14 | 0% | 68 |
| Wednesday | 13.5 | 3% | 68 |
| Thursday | 19.5 | 3% | 68 |
| Friday | 24 | 9% | 68 |
| Saturday | 33 | 24% | 67 |
| Sunday | 35 | 33% | 67 |
The 10 hardest Zip puzzles ever
Top of the list is #210 (October 13, 2025): a 7x7 with just 2 checkpoints and a 47-cell blind stretch. Every puzzle links to its full step-by-step answer.
| # | Date | Grid | Difficulty | Why it's brutal |
|---|---|---|---|---|
| #210 | October 13, 2025 | 7x7 | 100 | 22 walls · 27 turns · 2 checkpoints · 47-cell blind stretch |
| #98 | June 23, 2025 | 7x7 | 93 | 34 walls · 12 turns · 2 checkpoints · 47-cell blind stretch |
| #352 | March 4, 2026 | 8x8 | 89 | 36 walls · 28 turns · 6 checkpoints · 31-cell blind stretch |
| #15 | April 1, 2025 | 7x7 | 88 | 24 walls · 28 turns · 3 checkpoints · 44-cell blind stretch |
| #157 | August 21, 2025 | 8x8 | 82 | 14 walls · 40 turns · 6 checkpoints · 25-cell blind stretch |
| #366 | March 18, 2026 | 8x8 | 77 | 24 walls · 33 turns · 6 checkpoints · 18-cell blind stretch |
| #424 | May 15, 2026 | 8x8 | 72 | 24 walls · 32 turns · 8 checkpoints · 18-cell blind stretch |
| #131 | July 26, 2025 | 8x8 | 69 | 18 walls · 34 turns · 7 checkpoints · 13-cell blind stretch |
| #162 | August 26, 2025 | 7x7 | 69 | 13 walls · 38 turns · 7 checkpoints · 33-cell blind stretch |
| #467 | June 27, 2026 | 8x8 | 69 | 28 walls · 25 turns · 8 checkpoints · 19-cell blind stretch |
Zip records
Grid sizes: 6×6, 7×7 and 8×8 eras
Grid size is the single biggest difficulty driver: median difficulty steps 13 (6x6) → 33 (7x7) → 57 (8x8).
And the easiest ever?
All small boards with zero walls and checkpoints so dense the path almost draws itself: #204 (6x6, 0 walls, difficulty 0) · #345 (6x6, 0 walls, difficulty 1) · #315 (6x6, 0 walls, difficulty 1) · #262 (6x6, 0 walls, difficulty 2) · #184 (6x6, 0 walls, difficulty 2).
Methodology
Every daily Zip board since #1 is archived and solved on this site. For each puzzle we extract five structural signals: grid size (cells to fill), wall count (blocked edges), turns in the solved path, the longest unguided stretch between numbered checkpoints, and cells per checkpoint. Each signal is standardized across the full archive and combined (weights: 25% grid, 25% turns, 20% walls, 15% stretch, 15% density), then rescaled to 0-100. The index measures board structure, not solve time, which depends on the solver. Data updates automatically as each new daily puzzle is added; cite this page freely with a link (CC BY 4.0). Want to test yourself against the monsters above? Each links to its archived step-by-step answer, or read how to solve LinkedIn Zip first.
Frequently asked
What is the hardest LinkedIn Zip puzzle ever?
Measured across all 473 daily puzzles, the hardest LinkedIn Zip so far is puzzle #210 from October 13, 2025: a 7x7 board with only 2 numbered checkpoints, 22 wall segments, and a 47-cell stretch you must route without passing a single checkpoint.
Is LinkedIn Zip harder on weekends?
Yes, and the data proves it. LinkedIn schedules larger grids toward the weekend: Saturdays and Sundays are 24% and 33% 8×8 boards, while Mondays and Tuesdays have never had one. Median structural difficulty roughly doubles from midweek to Sunday.
What makes a Zip puzzle hard?
Four things, measurably: a bigger grid (more cells to fill), more walls (fewer legal routes), more forced turns in the solution path, and fewer numbered checkpoints, especially long stretches between them, where you must commit to a route with no confirmation you're right.
How is Zip difficulty measured here?
We compute a structural difficulty index (0 to 100) from each puzzle's board data: grid size, wall count, turns in the solved path, the longest unguided stretch between checkpoints, and cells-per-checkpoint density. It measures the structure of the board, not solver skill. Human solve times will vary, but structure is what LinkedIn actually dials up and down.