(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 | |
|---|---|---|---|
 | Factor Map by ul-Rhymm (on 30. June 2024, 14:57) | 45 |  99 % |
| Yin-Yang Whisperominos by Die Hard (on 4. August 2024, 11:15) | 37 | 94 % |
| Shield Birds by 99%Sneaky (on 16. September 2024, 23:44) | 105 | 94 % |
| Slide & Seek #1: An X-wing on Diamonds by Pixel_StrengthReal (on 11. January 2025, 19:42) | 18 | 94 % |
| Dutch Flat Mates (Product Ltd + Skyscrapers) by Crusader175 (on 19. March 2025, 11:30) | 43 | 96 % |
| Shmiddty business by NicoD (on 11. October 2025, 05:30) | 36 | 95 % |
| Rituz Unicorno Unicorno XVI - Variation 2 by AJN (on 11. January 2026, 13:46) | 37 | 92 % |
| Chaotic Meidjuluk #3 by PrimeWeasel (on 12. January 2026, 15:29) | 19 | 100 % |
| Japanische Summen - Krypto by ibag (on 22. July 2012, 09:20) | 83 | 99 % |
| Anti-Renban Killer by Phistomefel (on 10. March 2020, 13:05) | 94 | 97 % |
| Hidden Thermo Sudoku by Prutsbeest (on 28. September 2021, 17:06) | 64 | 97 % |
| Heated Entropic Loop by yttrio (on 23. February 2024, 20:12) | 63 | 97 % |
| Two Strings by zegres (on 21. July 2022, 04:38) | 125 | 98 % |
| Circles and Sets by JeffWajes (on 22. January 2024, 02:21) | 110 | 97 % |
| Happy birthday, pin7guin by ibag (on 6. September 2011, 00:00) | 43 | 92 % |
| Killer Sudoku (WSC 2019 Leftover) by Realshaggy (on 9. September 2019, 21:23) | 102 | 95 % |
| High Winds (Arrow Sudoku) by Agent (on 16. May 2021, 09:00) | 42 | 94 % |
| Double Duty | Zweifache Zahlenbedeutung by olima (on 21. February 2023, 22:52) | 48 | 98 % |
| My cup of tea - arrow/killer sudoku by Mr.Menace (on 23. April 2021, 22:07) | 39 | 97 % |
| ADVENTSKALENDER - Buchstabenrätsel / Letter Puzzle by DocLogic (on 20. December 2022, 14:35) | 34 | 97 % |
