(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 | |
|---|---|---|---|
 | Eternal escalation by NicoD (on 4. August 2025, 05:30) | 93 |  96 % |
| Heliolatry by NicoD (on 12. September 2025, 05:30) | 34 | 95 % |
| 45 Different Numbers by billybeth (on 3. October 2025, 10:26) | 31 | 95 % |
| 23 Killer by Florian Wortmann (on 18. January 2023, 18:50) | 82 | 95 % |
| XV*3.2 by NurglesGift (on 26. July 2024, 10:05) | 197 | 97 % |
| Pinch Yourself (Killer Sudoku) by purpl (on 1. February 2022, 22:31) | 67 | 96 % |
| Six-pack Linked Sudokus #4 by Genomico (on 12. March 2021, 01:16) | 80 | 99 % |
| KICK 4 by timyoth (on 8. April 2024, 11:05) | 103 | 93 % |
| Teilchenzoo - Einzelkind by lupo (on 24. February 2013, 07:37) | 36 | 98 % |
| New sudoku variant: Earthquake by grkles (on 14. March 2021, 05:58) | 19 | 99 % |
| Good Friday and Easter Themed - " The Holy Trinity" by MavericksJD (on 2. April 2021, 11:15) | 26 | 94 % |
| Revenge of the Zeros: The sequel by Joseph nehme (on 17. July 2021, 08:56) | 20 | 97 % |
| Rolling Snowballs by Nordy (on 7. December 2021, 22:11) | 23 | 90 % |
| Equal Color Sums by rmahus (on 6. January 2022, 08:00) | 22 | 93 % |
| Balance = Entropy by JeremyDover (on 12. February 2022, 23:59) | 115 | 99 % |
| Three and a Half by Nordy (on 14. April 2022, 08:00) | 18 | 91 % |
| Arrow Bites by PotatoHead21 (on 30. October 2022, 21:57) | 23 | 99 % |
| Pam Li arrow or rail map? by palpot (on 31. January 2024, 17:38) | 29 | 92 % |
| Prime Pairings by MSDOS (on 1. June 2024, 09:33) | 21 | 94 % |
| Take More U-Turns by Black_Doom (on 30. June 2024, 18:39) | 64 | 96 % |
