(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 | |
|---|---|---|---|
 | Kakuro S-Cells Loop [Secret Satan #1] by Christounet (on 25. January 2024, 11:57) | 32 |  98 % |
| Emergence by Jay Dyer (on 27. May 2024, 00:01) | 105 | 97 % |
| Roller Coaster mit Extras 8 by Uhu (on 19. August 2018, 10:12) | 57 | 98 % |
| Pinch Hitter by ViKingPrime (on 14. May 2024, 03:00) | 30 | 91 % |
| Olympic Rings by Jobo (on 5. August 2024, 01:14) | 98 | 96 % |
| Every Which Way But Up by HalfBakedLunatic (on 19. January 2025, 19:03) | 64 | 92 % |
| Rätsel Siebenkampf by moss (on 29. September 2016, 22:00) | 44 | 98 % |
| Deconstruksum [Position Sums Deconstruction] by Christounet (on 26. February 2023, 13:39) | 52 | 100 % |
| Decapitated (Chaos Construction) by Black_Doom (on 14. January 2024, 18:48) | 120 | 96 % |
| Die Kryptos - S02E06: Summenbild Rundweg / Sudoku by tuace (on 16. March 2018, 15:10) | 41 | 100 % |
| Happy Birthday, marcmees! by ibag (on 15. August 2020, 00:00) | 19 | 100 % |
| Killer Sudoku - The Knot by Phistomefel (on 31. August 2020, 23:10) | 100 | 99 % |
| House Party by DadJokes (on 6. November 2023, 20:16) | 20 | 97 % |
| Coatlicue by aqjhs (on 12. December 2024, 14:41) | 46 | 94 % |
| Signpost Nanro (Aqre) by KNT (on 12. April 2025, 23:06) | 44 | 94 % |
| a brutal bliss beyond this empty defeat by aqjhs (on 14. August 2025, 21:36) | 22 | 98 % |
| Japanese Sums Fillomino (10x10) by Jesper (on 2. December 2021, 09:41) | 58 | 99 % |
| Sandwich Battle 2 by Strosahl (on 22. September 2020, 19:22) | 37 | 94 % |
| Irrwisch Sudoku: X-Sums by Gliperal (on 1. June 2023, 01:41) | 70 | 98 % |
| Anableps (Aquarium + Myopia) by sfushidahardy (on 17. February 2025, 17:38) | 37 | 97 % |
