(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 | |
|---|---|---|---|
 | A puzzle of two halves by arbitrary (on 13. April 2024, 11:32) | 89 |  98 % |
| Zodiac Project: Minefield Maneuvers by SamuPiano (on 30. June 2024, 15:00) | 92 | 97 % |
| Secret Crossing by Groktilian (on 18. November 2024, 07:00) | 48 | 93 % |
| Wichtel 2017 (6): Easy as Kakuro by wichtel (on 22. June 2018, 10:04) | 58 | 97 % |
| 9x9 Fillomino Skyscrapers by Jesper (on 10. August 2020, 22:28) | 54 | 96 % |
| Dutch Flat Mates: Inntel Zaandam (Between Lines) by Qodec (on 14. January 2026, 07:00) | 63 | 97 % |
| Uraninite (Killer cages, Odd/Even) by Bellsita (on 24. July 2024, 20:22) | 96 | 92 % |
| Wichtelkalender 2012 (12) und Schluss by wichtel (on 1. December 2012, 09:00) | 62 | 95 % |
| Die Kryptos - S01E06: ABC-Box by tuace (on 24. September 2017, 11:48) | 53 | 96 % |
| Partial Killer 1 by MavericksJD (on 23. September 2020, 09:41) | 59 | 93 % |
| Hybridsudoku, „Der kleine Trommler“ by glum_hippo (on 22. December 2020, 20:54) | 49 | 94 % |
| Sudoku Variants Series (307) - Sum Snake Sudoku by Richard (on 10. February 2021, 00:00) | 84 | 96 % |
| "Doughts" for Bigger by PetLov (on 12. March 2021, 10:00) | 15 | 95 % |
| Sagitta by Joseph nehme (on 29. May 2021, 06:13) | 40 | 94 % |
| Sándor Tótka (Tokyo 2020) by Lisztes (on 11. August 2021, 01:00) | 17 | 90 % |
| Familiar combo by PetLov (on 14. August 2021, 20:32) | 16 | 91 % |
| Stuck In The Middle With You (Between Broken 159) by tallcat (on 15. January 2022, 00:11) | 52 | 98 % |
| Mutant Fillomino by au voleur! (on 19. February 2022, 18:03) | 27 | 95 % |
| Battle With The Archers 31: When Allies Collide by Playmaker6174 (on 29. April 2022, 22:59) | 70 | 98 % |
| CtC 500k Tribute by apiyo (on 30. August 2022, 05:56) | 14 | 91 % |
