(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 | |
|---|---|---|---|
 | Chaotic Meidjuluk #3 by PrimeWeasel (on 12. January 2026, 15:29) | 23 |  100 % |
| Yin Yang Position Sums Sudoku by Jesper (on 3. November 2022, 19:17) | 77 | 98 % |
| Quantum Irregularities by gdc (on 29. June 2024, 19:13) | 53 | 96 % |
| Projectile Perturbation by DadJokes (on 24. August 2022, 19:34) | 90 | 96 % |
| Would I lie to you? by juggler (on 17. December 2024, 01:37) | 82 | 96 % |
| Twin Killer Sudoku 2008-2009 by Richard (on 1. January 2009, 00:01) | 173 | 93 % |
| X---Ternal by riffclown (on 13. January 2022, 00:48) | 26 | 95 % |
| Ironworks by Bremster (on 20. January 2022, 00:08) | 35 | 95 % |
| Glyphs #3 by damasosos92 (on 12. January 2023, 16:17) | 28 | 96 % |
| Polysemy (Castle wall/Masyu/Knapp daneben) by dumediat (on 23. August 2025, 13:56) | 29 | 100 % |
| 45 Different Numbers by billybeth (on 3. October 2025, 10:26) | 32 | 96 % |
| The Monarch's Math by AFrayedKnot (on 5. March 2026, 09:06) | 29 | 93 % |
| Give Me a 13! by Md88keys (on 25. April 2026, 02:30) | 62 | 93 % |
| Mods, Quads & Odds by ThePedallingPianist (on 15. October 2023, 22:19) | 97 | 98 % |
| ← Find-the-Whisper-Loop → by ElChiglia (on 23. March 2024, 07:15) | 37 | 92 % |
| Dragon Road by Black_Doom (on 14. July 2025, 17:25) | 70 | 97 % |
| Japanische Summen auf Antimagneten(2) by r45 (on 9. July 2013, 09:07) | 68 | 99 % |
| Dead Roman Miracle by Fool on Hill (on 30. July 2022, 11:26) | 85 | 95 % |
| Until Ten (10-lines, parity mirror) by the_cogito (on 20. February 2023, 15:28) | 41 | 97 % |
| U-Bahn 3 by wooferzfg (on 28. June 2025, 06:28) | 39 | 95 % |
