(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 | |
|---|---|---|---|
 | Charybdis by Gliperal (on 21. March 2021, 05:46) | 44 |  97 % |
| Alley of Arrows by MavericksJD (on 19. April 2021, 13:36) | 31 | 99 % |
| Intersections Sudoku by RockyRoer (on 16. July 2021, 14:00) | 19 | 92 % |
| Broken Square by PotatoHead21 (on 14. August 2021, 08:24) | 21 | 99 % |
| Pentominoes Intersection by RockyRoer (on 13. September 2021, 00:54) | 23 | 99 % |
| Pandemonium by Testarossa (on 19. September 2021, 11:11) | 16 | 94 % |
| The Red and the Black (Anti-King Arrow) by tallcat (on 18. October 2021, 15:41) | 44 | 92 % |
| Equal Sudoku by kolot (on 25. October 2021, 07:39) | 23 | 99 % |
| Killoc4tor: Kill List by starwarigami (on 14. November 2021, 03:07) | 22 | 100 % |
| Patches and Stitches by Sktx (on 15. November 2021, 13:00) | 27 | 96 % |
| Anti-King Killer by Jeet Sampat (on 18. November 2021, 05:00) | 16 | 92 % |
| Build Your Own Aquarium by wooferzfg (on 5. February 2022, 16:54) | 28 | 100 % |
| Recycler by Jay Dyer (on 24. March 2022, 19:39) | 20 | 98 % |
| Ghost by Jay Dyer (on 13. April 2022, 15:50) | 23 | 96 % |
| Jet Lag (Renban Killer Sudoku) by Agent (on 29. April 2022, 09:00) | 21 | 94 % |
| Stepwell by mormagli (on 14. May 2022, 07:17) | 17 | 94 % |
| Wichtel 2021 (10): Eine lange Reise by wichtel (on 8. November 2022, 02:12) | 18 | 99 % |
| Full Rank Sandwich by RockyRoer (on 5. June 2022, 03:22) | 46 | 100 % |
| Ma'at's Transcript: Order from Chaos (Chaos Construction) by Chilly (on 13. July 2022, 13:07) | 79 | 100 % |
| C.C. Geass by lerroyy (on 8. August 2022, 04:00) | 42 | 99 % |
