(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 | |
|---|---|---|---|
 | Battle With The Archers 13: Unlucky Encounter by Playmaker6174 (on 27. August 2021, 19:14) | 34 |  96 % |
| A Latin Earthquake by PrimeWeasel (on 15. April 2022, 22:56) | 18 | 97 % |
| The Descent by mathpesto (on 12. October 2022, 03:41) | 25 | 94 % |
| Glyphs #4 by damasosos92 (on 28. January 2023, 20:42) | 22 | 91 % |
| Spurious Skyscrapers by Yawnus (on 12. March 2023, 13:54) | 23 | 91 % |
| LM-Übungsrätsel: No Same Sums by CJK (on 1. July 2023, 20:23) | 14 | 96 % |
| 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 % |
| Building Regions in Fog of War: Border Patrol 1 by Jeet Sampat (on 23. March 2024, 17:59) | 37 | 91 % |
| Yin-Yang-Yong by marty_sears (on 13. May 2024, 00:27) | 40 | 94 % |
| Amaterasu [Thermo Sudoku] by wisty (on 27. March 2023, 10:15) | 27 | 90 % |
| Marmoset by jwsinclair (on 2. July 2024, 16:05) | 31 | 98 % |
| Krypto Sandwich Sudoku by Realshaggy (on 30. December 2019, 15:22) | 45 | 90 % |
| Martytram Snake by Prof.Dori (on 6. June 2024, 15:38) | 18 | 91 % |
| Get Up on the Hydra's Back! (Chaos Construction) by tesseralis (on 20. August 2022, 10:38) | 38 | 100 % |
| Loose associations (Numbered rooms/Remote sums/Region sum lines) by dumediat (on 6. October 2023, 21:39) | 55 | 93 % |
| Signature Sudoku by Nell Gwyn (on 5. September 2022, 06:10) | 14 | 100 % |
| Masyup Kakuro by purpl (on 17. March 2024, 22:08) | 17 | 92 % |
| Slow Snake Somedoku by blackjackfitz (on 11. July 2024, 05:25) | 28 | 98 % |
| nabneR by zetamath (on 4. July 2021, 17:35) | 66 | 98 % |
