(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 | |
|---|---|---|---|
 | Sudokuvania: Digits of Despair (v1.1.1) by SkepticalMario (on 4. April 2025, 02:27) | 194 |  100 % |
| Adventsportale, Teil 4 by pirx (on 23. December 2018, 12:00) | 46 | 99 % |
| Liar Japanese Sums #5 - Ciphered Cave by Niverio (on 11. February 2023, 11:40) | 54 | 99 % |
| Fillomino Chaos Construction #2 by dennischen (on 7. June 2023, 18:15) | 45 | 97 % |
| Japanese Sums: Pentomi-ones by Niverio (on 27. February 2024, 00:58) | 22 | 92 % |
| Zodiac Project: Cluster of Galaxies by Prof.Dori (on 6. November 2024, 00:51) | 36 | 98 % |
| Renrenbanban by DarthParadox (on 25. April 2023, 17:54) | 55 | 98 % |
| Hysteria (Chaos Construction) by ThePedallingPianist (on 14. April 2024, 04:56) | 51 | 97 % |
| Steel Vengeance (Chaos Deconstruction Rollercoaster) by tallcat (on 2. September 2024, 08:00) | 52 | 97 % |
| Dynamic Construction by Niverio (on 6. April 2022, 00:26) | 41 | 99 % |
| Eine Runde Inselhopping mit Höhlentour by tuace (on 29. July 2014, 08:30) | 27 | 98 % |
| Kropkiflotte auf hoher See III by Luigi (on 30. October 2014, 13:51) | 19 | 94 % |
| Soap Opera by Jay Dyer (on 28. January 2024, 21:19) | 39 | 93 % |
| absolute annihilation by aqjhs (on 6. December 2024, 06:12) | 36 | 94 % |
| Big Bad Wolf by IcyFruit (on 10. April 2025, 14:24) | 102 | 98 % |
| Kurotto Killer Sudoku by KNT (on 29. July 2022, 04:21) | 72 | 95 % |
| Roller Coaster mit Extras 16 by Uhu (on 5. March 2020, 07:34) | 29 | 99 % |
| Star-Crossed Sandwiches by DarthParadox (on 25. January 2024, 01:26) | 31 | 92 % |
| Tetropolis by sfushidahardy (on 4. October 2024, 17:18) | 31 | 99 % |
| Taco Bowl 3 - Ring Of Fire by DiMono (on 19. March 2021, 16:15) | 40 | 100 % |
