(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 | |
|---|---|---|---|
 | Supermoon by ViKingPrime (on 19. October 2024, 21:45) | 49 |  96 % |
| Foursquare by NicoD (on 6. May 2025, 05:30) | 56 | 94 % |
| Cave of Killers by Jay Dyer (on 22. April 2024, 23:41) | 127 | 97 % |
| Chiaroscuro-doku by yttrio (on 8. March 2025, 02:03) | 122 | 99 % |
| LM 2018 Countdown: U-Bahn mit Haltestellen by tuace (on 8. June 2018, 09:06) | 32 | 97 % |
| Star Nurikabe #47 by BenceJoful (on 31. August 2021, 18:04) | 42 | 98 % |
| Segue Ursa by Prof.Dori (on 18. January 2024, 01:21) | 36 | 98 % |
| ¡Dame Quince! (Killer Sudoku) by sujoyku (on 30. March 2025, 15:40) | 160 | 97 % |
| Quatre Coins: Four Corners 2 (Kropki Arrow X) by tallcat (on 11. July 2021, 14:51) | 72 | 95 % |
| Boxed In (German Whispers Renban Sudoku) by Cane_Puzzles (on 3. September 2021, 17:50) | 70 | 97 % |
| Lux Umbra (Anti/Quadruples, Numbered Rooms) by Crusader175 (on 4. July 2023, 19:00) | 65 | 96 % |
| Island Sum Lines by yttrio (on 1. November 2025, 00:22) | 176 | 98 % |
| Three of a Kind / Deutsche: Drilling by apiyo (on 1. October 2020, 11:44) | 36 | 92 % |
| Arrow Squaring [Killer, Arrow] by Miky (on 31. August 2021, 21:43) | 29 | 95 % |
| Learn the Alphabet: B is for Between Line by Crusader175 (on 26. January 2022, 17:30) | 37 | 95 % |
| The Demon Watch by Perladel (on 26. August 2022, 14:28) | 29 | 97 % |
| Entropic Expansion by magnageas (on 25. September 2022, 23:05) | 31 | 98 % |
| Killer Inception by mnasti2 (on 27. October 2022, 23:00) | 29 | 94 % |
| Eindeutig Zweideutig by Wuschel (on 26. May 2025, 14:20) | 34 | 90 % |
| Renban or Ren_an (Ambiguity Puzzle) by tallcat (on 11. December 2025, 03:41) | 25 | 92 % |
