(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 | |
|---|---|---|---|
 | Fill Rank Fullomino by Myxo (on 31. May 2023, 13:26) | 39 |  97 % |
| Eine Runde Inselhopping mit Höhlentour by tuace (on 29. July 2014, 08:30) | 27 | 98 % |
| Brambles by Qodec (on 20. December 2020, 16:02) | 62 | 96 % |
| Mission Improbable by XeonRisq (on 5. August 2023, 17:00) | 27 | 98 % |
| U-Bahn under Tripleblock for polar by KNT (on 1. January 2024, 08:23) | 27 | 100 % |
| Numbered Blocks by Chad (on 14. February 2024, 23:33) | 30 | 95 % |
| Summation U-Bahn #4: Skyscrapers by Agent (on 30. September 2024, 09:00) | 29 | 100 % |
| Kropkiflotte auf hoher See III by Luigi (on 30. October 2014, 13:51) | 19 | 94 % |
| Loses Kalenderblatt April 2020 by April (on 1. April 2020, 00:00) | 18 | 100 % |
| Misfits by filuta (on 10. November 2022, 17:30) | 36 | 99 % |
| Japanese Sums: Pentomi-ones by Niverio (on 27. February 2024, 00:58) | 21 | 93 % |
| Steel Vengeance (Chaos Deconstruction Rollercoaster) by tallcat (on 2. September 2024, 08:00) | 39 | 96 % |
| Liar Japanese Sums #5 - Ciphered Cave by Niverio (on 11. February 2023, 11:40) | 48 | 99 % |
| Four Alien Theorem (Build Your Own Killer Sudoku) by Agent (on 7. April 2023, 09:00) | 47 | 99 % |
| Hysteria (Chaos Construction) by ThePedallingPianist (on 14. April 2024, 04:56) | 49 | 96 % |
| Junction by grkles (on 22. May 2021, 03:53) | 26 | 99 % |
| Kurotto Killer Sudoku by KNT (on 29. July 2022, 04:21) | 70 | 97 % |
| Taco Bowl 3 - Ring Of Fire by DiMono (on 19. March 2021, 16:15) | 40 | 100 % |
| Fillomino Chaos Construction #2 by dennischen (on 7. June 2023, 18:15) | 42 | 97 % |
| Roller Coaster mit Extras 16 by Uhu (on 5. March 2020, 07:34) | 28 | 99 % |
