(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 | |
|---|---|---|---|
 | Pfeilchenbeet / Arrow Farm by Phistomefel (on 17. November 2020, 20:01) | 56 |  99 % |
| Poltrona by ICHTUES (on 8. May 2022, 05:58) | 34 | 99 % |
| Watchers Along the Cave by tesseralis (on 9. August 2022, 08:54) | 33 | 96 % |
| Santa Puzzle - for dumediat by the_cogito (on 9. January 2023, 18:01) | 31 | 95 % |
| Donuts by Die Hard (on 26. October 2023, 03:30) | 34 | 100 % |
| The 12 Pentominoes of Christmas (Chaos) by DadJokes (on 8. January 2024, 15:19) | 32 | 100 % |
| Slingshot Fillomino by Jesper (on 15. September 2020, 08:38) | 45 | 99 % |
| Balanced Ride (Roller Coaster/Cave) by Piatato (on 23. October 2023, 11:00) | 41 | 99 % |
| Shade Your Own Puzzle: Fillomino vs Cave ft. Parity #3 - N difference (13x13) by Playmaker6174 (on 4. January 2025, 03:30) | 46 | 99 % |
| Antiking Killer Sudoku by PotatoHead21 (on 1. February 2023, 13:00) | 15 | 90 % |
| Abstract Art (Equalines, Entropy) by Mad-Tyas (on 27. February 2023, 09:16) | 40 | 98 % |
| Liar Japanese Sums #6 - Ciphered Tapa by Niverio (on 10. September 2023, 20:47) | 48 | 99 % |
| Diagonal Chaos Construction by Paletron (on 16. October 2023, 18:20) | 37 | 98 % |
| only love can save us by aqjhs (on 15. September 2025, 21:21) | 37 | 99 % |
| Assigned Pentominoes Loop #1 (14x18) by Playmaker6174 (on 11. February 2026, 14:00) | 37 | 99 % |
| A Challenge For Your Soul! (Satan 2025) by MathGuy_12 (on 1. March 2026, 05:10) | 11 | 95 % |
| Rectangle Sums by FIT7Y (on 15. March 2026, 00:00) | 41 | 93 % |
| Sudokoban by DiMono (on 19. January 2023, 16:35) | 66 | 96 % |
| Shade Your Own Puzzle: YinYang vs Sudoku #1 by Playmaker6174 (on 20. August 2024, 19:00) | 65 | 96 % |
| Vault Construction by the_cogito (on 12. July 2022, 16:43) | 59 | 98 % |
