(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 | |
|---|---|---|---|
 | Die Bahn ist auch auf dem Zylinder pünktlich ... by ibag (on 17. February 2021, 23:58) | 10 |  98 % |
| Antimagnetschlange by ibag (on 27. March 2021, 00:00) | 12 | 95 % |
| Hidden Identity Killers by Fluster (on 3. May 2021, 19:35) | 40 | 98 % |
| Small to big by lerroyy (on 15. January 2022, 19:26) | 12 | 93 % |
| Earthworm City (Killer + Renban Sudoku) by Sktx (on 17. August 2022, 10:57) | 12 | 98 % |
| Yin Yang Vaults by Schwupel (on 1. September 2022, 22:19) | 49 | 97 % |
| Three in the spotlight by Fool on Hill (on 11. September 2022, 15:21) | 26 | 94 % |
| Equivocation by SSG (on 27. September 2022, 07:02) | 35 | 97 % |
| Friendly Doublers by AstralSky (on 1. February 2023, 18:41) | 12 | 98 % |
| Corotating Photon Sphere (Black Hole) by heliopolix (on 16. April 2023, 08:34) | 42 | 95 % |
| Who’s the man in the mirror ? [9×9 mirrored digits] by Christounet (on 11. September 2023, 18:21) | 73 | 97 % |
| Double Ender by dodomos (on 15. September 2023, 10:00) | 15 | 90 % |
| Skyline by XeonRisq (on 1. June 2024, 22:00) | 11 | 98 % |
| Intuition by psninn (on 1. November 2024, 14:43) | 13 | 90 % |
| Numb Numerals by kieserel (on 22. November 2024, 08:42) | 12 | 95 % |
| demasiados bichos by aqjhs (on 25. July 2025, 00:14) | 27 | 96 % |
| MUSIK - großes Buchstabenrätsel / big letter puzzle by DocLogic (on 22. October 2025, 23:23) | 22 | 97 % |
| Big Latin Y² by Kaktuslav (on 29. October 2025, 08:00) | 73 | 99 % |
| The Crown of Lucifer by Donatello_86 (on 6. January 2026, 01:48) | 11 | 98 % |
| Region Sum Circus by JeffWajes (on 9. February 2026, 10:24) | 28 | 95 % |
