(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 | |
|---|---|---|---|
 | Islands by SamuPiano (on 7. December 2021, 04:52) | 42 |  98 % |
| X-Sum Arrows by Phistomefel (on 29. December 2020, 09:35) | 58 | 99 % |
| Radar by Jobo (on 10. August 2023, 09:48) | 76 | 93 % |
| Auf dem Oktoberfest by pirx (on 21. September 2013, 12:00) | 34 | 99 % |
| Die Kryptos - S01E06: ABC-Box by tuace (on 24. September 2017, 11:48) | 53 | 96 % |
| Wichtel 2019 (3): Die U-Bahn unter dem Geschenkelager by wichtel (on 9. July 2020, 20:01) | 45 | 100 % |
| Embedded Sandwich Sudoku - Taco Bowl by DiMono (on 8. March 2021, 06:41) | 39 | 98 % |
| "Doughts" for Bigger by PetLov (on 12. March 2021, 10:00) | 15 | 95 % |
| Sagitta by Joseph nehme (on 29. May 2021, 06:13) | 40 | 94 % |
| Square Wheel by twototenth (on 6. July 2021, 07:00) | 29 | 94 % |
| Sándor Tótka (Tokyo 2020) by Lisztes (on 11. August 2021, 01:00) | 17 | 90 % |
| Familiar combo by PetLov (on 14. August 2021, 20:32) | 16 | 91 % |
| A Little Deconstruction by djorr (on 14. April 2022, 14:00) | 26 | 93 % |
| Liar Kropki by Dandelo (on 1. April 2022, 00:14) | 13 | 98 % |
| Sudoku X Weirdity by Jeet Sampat (on 18. April 2022, 03:14) | 27 | 96 % |
| HyperBan by mormagli (on 20. June 2022, 23:33) | 13 | 95 % |
| Killomino by josh_johnson (on 9. July 2022, 04:16) | 46 | 93 % |
| Two Strings by zegres (on 21. July 2022, 04:38) | 120 | 97 % |
| CtC 500k Tribute by apiyo (on 30. August 2022, 05:56) | 14 | 91 % |
| Wheels on the Bus (Wheels, Disjoint) by Crusader175 (on 21. August 2023, 17:00) | 48 | 93 % |
