(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 | |
|---|---|---|---|
 | Unboxing by mathpesto (on 11. May 2023, 05:11) | 69 |  97 % |
| Reef by zetamath (on 26. June 2023, 03:35) | 122 | 97 % |
| Diagonal Chaos Construction by Paletron (on 16. October 2023, 18:20) | 35 | 98 % |
| The Landmark of Entropia by Mad-Tyas (on 30. March 2024, 09:11) | 36 | 93 % |
| Chaos FilloSudokumino: Deconstruction by MagnusJosefsson (on 19. January 2023, 16:12) | 78 | 98 % |
| Parity Party XXII, "Party Hearty" by glum_hippo (on 4. January 2022, 04:19) | 42 | 99 % |
| LYLY (double arrows) by Samish (on 5. October 2022, 09:09) | 21 | 94 % |
| Disam Bonkers by ICHTUES (on 1. January 2023, 06:00) | 21 | 96 % |
| Red Bubbles by antiknight (on 12. April 2023, 22:35) | 26 | 92 % |
| Remote Chaos by XeonRisq (on 4. January 2024, 19:00) | 20 | 96 % |
| One Of Two by Manta-Ray (on 18. November 2024, 15:36) | 24 | 90 % |
| A Game of Battleship! by Niverio (on 14. August 2022, 23:04) | 46 | 100 % |
| Productivity Killer (BYOK+) by SeveNateNine (on 18. October 2023, 02:45) | 61 | 95 % |
| Janus (Chiaroscuro + U-Bahn) by sfushidahardy (on 15. May 2025, 01:25) | 30 | 96 % |
| TH13TEEN by IcyFruit (on 13. September 2025, 13:13) | 61 | 92 % |
| Through Space and Time (Chaos Construction) by Agent (on 23. September 2025, 09:00) | 64 | 99 % |
| A Whole Bunch of Nonsense by Myxo (on 30. October 2023, 22:00) | 72 | 95 % |
| Fillomino 77 by Myxo (on 1. August 2023, 13:15) | 39 | 97 % |
| Clashing Chameleons by the_cogito (on 1. May 2025, 18:24) | 37 | 96 % |
| Unsichtbar Hochhauschaos by Luigi (on 22. November 2010, 12:54) | 37 | 95 % |
