(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | Geometry Exam #5 by Blashyrkh (on 9. August 2025, 19:45) | 107 |  97 % |
| The End of Your Rope by MathGuy_12 (on 10. August 2025, 16:15) | 17 | 93 % |
| Octagon by Jolly Rogers (on 31. August 2025, 18:18) | 46 | 95 % |
| Doppeldinger by ThePedallingPianist (on 19. September 2025, 19:30) | 13 | 90 % |
| Reciprocals by Kaktuslav (on 23. September 2025, 08:00) | 41 | 95 % |
| Segregated neighborhood by NicoD (on 29. September 2025, 05:30) | 18 | 91 % |
| Colours in the (k)night XIX by Villse (on 6. December 2025, 17:26) | 131 | 95 % |
| You Asked For It by Md88keys (on 24. October 2025, 21:18) | 20 | 94 % |
| Listen to the Wind Blow (Kropki Sum Lines, Mad Fold-in) by DubiousMobius (on 15. November 2025, 15:02) | 18 | 91 % |
| Three-way Balance by Kutsumi Hane (on 20. November 2025, 09:52) | 14 | 95 % |
| Triple Tapa by Nell Gwyn (on 28. November 2025, 21:47) | 34 | 94 % |
| Cartesian Sums: An introductory puzzle by damasosos92 (on 2. December 2025, 23:51) | 21 | 97 % |
| Line Items by ebiggie (on 9. December 2025, 00:06) | 31 | 91 % |
| Ça fait la rue Michel by Kjupatrick (on 10. December 2025, 15:46) | 29 | 92 % |
| traumbrache by aqjhs (on 28. January 2026, 01:23) | 27 | 93 % |
| Echo Chamber (Counting Circles + Cave Shading) by Allagem (on 24. December 2025, 04:32) | 37 | 96 % |
| Rail Pool by KNT (on 1. January 2026, 19:22) | 24 | 97 % |
| Bedlam by Andrewsarchus (on 6. January 2026, 14:22) | 13 | 100 % |
| Underling by jwsinclair (on 9. January 2026, 22:57) | 147 | 94 % |
| Yamanote (Loop Japanese Sums Sudoku) by Agent (on 10. February 2026, 09:00) | 48 | 99 % |
