(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 | |
|---|---|---|---|
 | Prison Negativity by Prof.Dori (on 30. January 2024, 18:54) | 21 |  90 % |
| Absolute Zero by juggler (on 8. March 2024, 08:24) | 48 | 94 % |
| Dishes Washed by timotab (on 25. May 2024, 15:59) | 57 | 91 % |
| Raspberry Cream by pieguy (on 6. March 2025, 23:27) | 23 | 93 % |
| Irregular Killer Sudoku 4 by Azure (on 14. April 2025, 15:18) | 40 | 91 % |
| Manta by IcyFruit (on 1. May 2025, 14:01) | 112 | 97 % |
| Losing Luck by AParliamentofOwls (on 30. October 2025, 20:35) | 23 | 94 % |
| Heavy by zetamath (on 1. January 2026, 22:16) | 136 | 97 % |
| J.O.E. by JayForty (on 7. February 2024, 14:42) | 85 | 97 % |
| Loop Compass by Agent (on 9. April 2024, 09:00) | 67 | 100 % |
| Schrödinger 203: Quantum Tunnelling by ViKingPrime (on 30. September 2023, 00:30) | 60 | 97 % |
| Musical Renban by Mayamor (on 20. April 2023, 14:30) | 54 | 95 % |
| All the Arrows, Big and Small by bboom (on 24. October 2024, 10:06) | 53 | 95 % |
| XOV to Cheyenne (0-9 Challenge) by The Bard (on 20. September 2025, 01:01) | 63 | 95 % |
| Squeez Theorem (Suguru Deconstruction) by KevinTheMH (on 28. June 2023, 21:33) | 36 | 93 % |
| Japanische Summen mit Rundweg by Uhu (on 14. September 2017, 15:52) | 54 | 98 % |
| Dallas by ICHTUES (on 10. October 2021, 06:00) | 89 | 96 % |
| Little Killers - But which way? by RockyRoer (on 25. August 2020, 22:39) | 45 | 94 % |
| A Year in the Making by Polycarp (on 20. February 2023, 01:19) | 30 | 90 % |
| Chessmates Sudoku by Genomico (on 30. November 2023, 23:54) | 29 | 91 % |
