(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 | |
|---|---|---|---|
 | Cagey Royalty by Jagga (on 11. August 2022, 21:43) | 30 |  99 % |
| Gonna (Kouchoku) by Wessel Strijkstra (on 21. October 2022, 12:39) | 25 | 96 % |
| Foxtrot by zetamath (on 1. August 2024, 18:40) | 32 | 97 % |
| traumbrache by aqjhs (on 28. January 2026, 01:23) | 26 | 93 % |
| Give or Take (Yin Yang Killer) by tallcat (on 11. November 2024, 18:21) | 117 | 95 % |
| (9x9) Chaos Construction: X-sums Doubled Limit by Playmaker6174 (on 16. March 2023, 04:14) | 61 | 96 % |
| A Fillomino for the Bees by mathpesto (on 13. June 2023, 19:53) | 50 | 95 % |
| Think inside the... by KMD (on 10. October 2025, 15:11) | 59 | 91 % |
| The Graveyard Of Shadows by fjam (on 22. September 2022, 19:02) | 84 | 97 % |
| A Bright Idea by SenatorGronk (on 5. January 2022, 01:55) | 34 | 93 % |
| Cyclone by antiknight (on 2. September 2022, 04:07) | 33 | 91 % |
| Pointing Digits Sudoku by clover (on 3. February 2024, 20:03) | 84 | 96 % |
| Unboxing (11x11 deconstruction) by jwsinclair (on 13. December 2024, 20:15) | 95 | 96 % |
| Hellseherische X-Sums (Sudoku) by glum_hippo (on 13. February 2025, 04:58) | 29 | 96 % |
| Symmetry Exquisite Trouble by Br1312te (on 18. June 2025, 14:08) | 35 | 98 % |
| Adventskalender 2018 (Teil 23) - Yajilin by Zzzyxas (on 23. December 2018, 07:00) | 80 | 95 % |
| Roller Coaster mit Extras 10 by Uhu (on 28. September 2018, 20:57) | 53 | 97 % |
| clover's expert math class by Qodec (on 13. July 2021, 23:09) | 56 | 99 % |
| Bridge Four by Calvinball (on 5. January 2025, 06:31) | 60 | 94 % |
| Schatzsuche (2001) - Rundweg knapp daneben by AI1463 (on 6. July 2014, 14:06) | 28 | 97 % |
