(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 | |
|---|---|---|---|
 | Rising Arrow Sudoku - Halloween Crab by DiMono (on 3. June 2021, 18:26) | 54 |  97 % |
| Deconstruction Chaos Suguru #1,729: It’s All a Lie! by mathpesto (on 2. April 2022, 20:58) | 123 | 99 % |
| Skyscraper^2 Sudoku by Prasanna16391 (on 5. August 2020, 13:47) | 24 | 99 % |
| Encaged Kropki #2 - oops! no cage totals! by RockyRoer (on 21. October 2020, 00:00) | 22 | 99 % |
| Recycler by Jay Dyer (on 24. March 2022, 19:39) | 24 | 99 % |
| Wichtel 2021 (10): Eine lange Reise by wichtel (on 8. November 2022, 02:12) | 19 | 99 % |
| C.C. Geass by lerroyy (on 8. August 2022, 04:00) | 46 | 99 % |
| Unendliches Höhlenrätsel (Infinity Cave) by Phistomefel (on 3. April 2023, 20:00) | 27 | 91 % |
| Decompression [TSL][S1T6] by jwsinclair (on 18. July 2025, 23:22) | 45 | 95 % |
| Life, Uh, Finds a Way by juggler (on 9. September 2025, 00:03) | 49 | 95 % |
| The third wheel by chameleon (on 13. October 2025, 13:19) | 25 | 92 % |
| Four Colour Theorem by Jay Dyer (on 19. March 2022, 13:12) | 119 | 97 % |
| Chaos Arrows by Sotehr (on 27. September 2024, 15:19) | 51 | 93 % |
| Adorable Fury by DiMono (on 5. October 2021, 17:30) | 22 | 94 % |
| FMTC by Starstorm (on 20. June 2023, 21:21) | 20 | 91 % |
| Building Regions in Fog of War: Border Patrol 2 by Jeet Sampat (on 7. April 2024, 12:24) | 24 | 91 % |
| Index-istential Crisis (with ChinStrap) by sujoyku (on 19. January 2025, 13:39) | 43 | 97 % |
| Fifth Wheel by IcyFruit (on 27. February 2025, 14:27) | 93 | 99 % |
| Redshift by ThePedallingPianist (on 6. September 2025, 22:05) | 23 | 98 % |
| LUSTIG - großes Buchstabenrätsel / big Letter Puzzle by DocLogic (on 24. September 2025, 17:09) | 20 | 97 % |
