(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 | |
|---|---|---|---|
 | Schrödinger's Pseudoku by starwarigami (on 27. February 2025, 19:37) | 22 |  90 % |
| A Clockwork Orange by .proxz14 (on 29. March 2025, 11:11) | 18 | 93 % |
| Rätselsuppe III by Luigi (on 30. June 2010, 08:04) | 77 | 96 % |
| Agathokakological by NicoD (on 25. June 2025, 05:30) | 66 | 94 % |
| Compass Fillomino #5: Large Ring by MagnusJosefsson (on 3. September 2021, 10:59) | 37 | 96 % |
| Boogie by Andrewsarchus (on 21. March 2025, 05:18) | 36 | 93 % |
| Pentopia Rundweg II by tuace (on 22. April 2019, 09:55) | 53 | 99 % |
| WPC Preparation 2019: Loopfinder by pwahs (on 3. January 2021, 16:23) | 17 | 93 % |
| Poison Arrow 2 by FryTheGuy (on 13. May 2021, 04:04) | 18 | 93 % |
| Regional Chess Sums: A Proper Introduction by Nordy (on 24. January 2022, 09:30) | 15 | 95 % |
| Motel (Deconstruction: Numbered Rooms) by purpl (on 8. April 2022, 16:42) | 48 | 98 % |
| Questionable Chaos (Y-sums / Skyscrapers sums chaos construction) by Lizzy01 (on 30. May 2022, 11:59) | 19 | 95 % |
| Die Kryptos - S05E04: Zelte und Bäume by tuace (on 1. September 2022, 20:22) | 15 | 98 % |
| LM-Quali 2023 Leftover: Hashiwokakero by CJK (on 12. March 2023, 20:23) | 17 | 95 % |
| Double Killer Sudoku by clover (on 15. December 2023, 21:57) | 35 | 99 % |
| Round Robin by IcyFruit (on 12. January 2024, 21:24) | 34 | 96 % |
| Yo Dawg by lmdemasi (on 29. January 2024, 01:38) | 17 | 98 % |
| Parity Party XXIX, "Psy Ops" by glum_hippo (on 3. April 2024, 00:38) | 15 | 95 % |
| .357 Magnum by EricRathbun (on 1. March 2025, 06:33) | 20 | 93 % |
| Slitherlinked (Permaculture) by the_cogito (on 10. March 2025, 19:34) | 17 | 96 % |
