(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 | |
|---|---|---|---|
 | Whisper Doublers by yttrio (on 3. March 2023, 05:09) | 53 |  96 % |
| Sigma Pi by IcyFruit (on 7. December 2023, 21:50) | 84 | 93 % |
| Ereignisreiches Rätseljahr by Zzzyxas (on 31. December 2013, 06:00) | 25 | 97 % |
| Delray Beach Sunrise (Yin-YANG Fillomino) by MaizeGator (on 6. August 2024, 04:04) | 59 | 98 % |
| Blackjack by apiyo (on 27. October 2020, 07:41) | 34 | 91 % |
| Adventskalender 2020, Türchen 23 - Kerzen by Zzzyxas (on 23. December 2020, 07:00) | 46 | 90 % |
| The Four Pyramids by EricRathbun (on 10. December 2022, 23:03) | 51 | 96 % |
| Japanese Sums #5: Disposition by Myxo (on 10. October 2023, 11:55) | 60 | 98 % |
| Scattered Odd Killer by MavericksJD (on 10. May 2021, 13:23) | 26 | 98 % |
| Battle With The Archers 13: Unlucky Encounter by Playmaker6174 (on 27. August 2021, 19:14) | 33 | 96 % |
| A Latin Earthquake by PrimeWeasel (on 15. April 2022, 22:56) | 17 | 97 % |
| The Descent by mathpesto (on 12. October 2022, 03:41) | 25 | 94 % |
| Disturbed Balance by lepton (on 19. December 2022, 20:35) | 21 | 98 % |
| Walking a Nine Line (Chaos Construction) by the_cogito (on 5. February 2023, 16:19) | 39 | 95 % |
| Amaterasu [Thermo Sudoku] by wisty (on 27. March 2023, 10:15) | 26 | 90 % |
| LM-Übungsrätsel: No Same Sums by CJK (on 1. July 2023, 20:23) | 14 | 96 % |
| Filloku by mormagli (on 8. September 2023, 20:38) | 19 | 95 % |
| Factor Finesse by Mad-Tyas (on 5. December 2023, 11:50) | 12 | 96 % |
| The Serpent Devouring Rome by JeffWajes (on 18. March 2024, 01:16) | 23 | 90 % |
| Sudokabe [Nurikabe Deconstruction] by Christounet (on 20. March 2024, 12:08) | 37 | 98 % |
