(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 | |
|---|---|---|---|
 | Primetime (Mystery Killer) by Mad-Tyas (on 11. August 2021, 00:14) | 27 |  96 % |
| Lockout Flower by FryTheGuy (on 27. September 2021, 19:04) | 32 | 98 % |
| Secret Caverns by GarlicBredFries (on 31. October 2022, 23:25) | 30 | 93 % |
| Words With Friends by lmdemasi (on 16. March 2025, 23:41) | 29 | 97 % |
| Chaconopia Playground by Mad-Tyas (on 5. September 2025, 10:55) | 30 | 100 % |
| Backslasher by NicoD (on 15. April 2026, 05:30) | 27 | 93 % |
| Nurikabe Killer Sudoku by udukos (on 26. December 2020, 16:33) | 60 | 98 % |
| Teleportation Cycle Sum Sudoku by SudokuExplorer (on 6. April 2021, 01:00) | 58 | 100 % |
| Wichtel 2016 (10): Kakuro-Hitori by wichtel (on 13. September 2017, 02:02) | 57 | 95 % |
| Double-or-nothing by tesseralis (on 13. August 2022, 09:30) | 30 | 95 % |
| Chaos Construction: Arrow In-10x10-sity by XeonRisq (on 21. August 2022, 04:00) | 32 | 99 % |
| Richmond (Killer Diagonal) by tallcat (on 13. December 2022, 18:03) | 95 | 97 % |
| Near and far (Kropki pairs/Remote sums/X-sums) by dumediat (on 26. May 2023, 13:54) | 30 | 98 % |
| Deconstruction: X-Sums by Jesper (on 21. March 2022, 10:26) | 127 | 100 % |
| Red Square Blue Square by marty_sears (on 7. June 2023, 17:29) | 102 | 98 % |
| Loes den (kleinen) Irrwisch! by ibag (on 23. July 2017, 08:25) | 29 | 99 % |
| WORTMISCHUNG - 3D Buchstabenrätsel / letter puzzle by DocLogic (on 26. January 2020, 00:52) | 33 | 98 % |
| Cogito Ergo Santa by grkles (on 26. December 2022, 17:02) | 31 | 98 % |
| Quadrature by Jay Dyer (on 6. February 2023, 23:33) | 69 | 95 % |
| Down for the Count by juggler (on 31. October 2024, 19:06) | 64 | 95 % |
