(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 | |
|---|---|---|---|
 | Decapitated (Chaos Construction) by Black_Doom (on 14. January 2024, 18:48) | 117 |  96 % |
| Lügner Rundwege - Liar Loops by Calavera (on 17. November 2009, 19:32) | 63 | 97 % |
| Primesweeper Sudoku by SenatorGronk (on 23. June 2020, 01:30) | 36 | 93 % |
| 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 % |
| Die Kryptos - S02E06: Summenbild Rundweg / Sudoku by tuace (on 16. March 2018, 15:10) | 41 | 100 % |
| Killer Sudoku - The Knot by Phistomefel (on 31. August 2020, 23:10) | 99 | 99 % |
| Meidjuluk Star Battle by Grausbert (on 19. June 2023, 15:30) | 24 | 96 % |
| House Party by DadJokes (on 6. November 2023, 20:16) | 20 | 97 % |
| Coatlicue by aqjhs (on 12. December 2024, 14:41) | 46 | 94 % |
| a brutal bliss beyond this empty defeat by aqjhs (on 14. August 2025, 21:36) | 22 | 98 % |
| Two Twos and a Nine by ChinStrap (on 22. January 2025, 20:50) | 56 | 95 % |
| 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 % |
