(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 | |
|---|---|---|---|
 | Lying Stars 2 (Liar Partial Killer) by Djmelee3000 (on 21. September 2020, 06:02) | 27 |  94 % |
| Wichtel 2021 (1): Die Stadtviertel von Pentopia by wichtel (on 26. May 2022, 22:10) | 24 | 94 % |
| Cagey Royalty by Jagga (on 11. August 2022, 21:43) | 28 | 99 % |
| Knights & Knaves by ndsurgenor (on 23. October 2022, 12:00) | 24 | 94 % |
| Revolver by Myxo (on 2. February 2023, 12:08) | 77 | 93 % |
| Happy Holiday! by Richard (on 15. July 2011, 12:00) | 55 | 91 % |
| Eine Handvoll U-Bahnen (Teil 5) - Standard by Zzzyxas (on 18. February 2022, 22:50) | 50 | 99 % |
| Polar Vortex by mathpesto (on 2. October 2022, 22:42) | 52 | 91 % |
| Full Rank Sudoku by Gliperal (on 3. April 2023, 07:18) | 110 | 97 % |
| Eight Xs (XV sudoku) by Lisztes (on 19. November 2020, 01:00) | 27 | 93 % |
| Parity Party (Odd-Even coded) by Realshaggy (on 11. February 2021, 21:55) | 24 | 98 % |
| Entroguity by twototenth (on 26. July 2022, 08:00) | 27 | 93 % |
| (9x9) Chaos Construction: X-sums Doubled Limit by Playmaker6174 (on 16. March 2023, 04:14) | 60 | 96 % |
| Foxtrot by zetamath (on 1. August 2024, 18:40) | 32 | 97 % |
| Give or Take (Yin Yang Killer) by tallcat (on 11. November 2024, 18:21) | 114 | 95 % |
| Symmetry Exquisite Trouble by Br1312te (on 18. June 2025, 14:08) | 33 | 98 % |
| Adventskalender 2018 (Teil 23) - Yajilin by Zzzyxas (on 23. December 2018, 07:00) | 78 | 95 % |
| The Graveyard Of Shadows by fjam (on 22. September 2022, 19:02) | 83 | 97 % |
| clover's expert math class by Qodec (on 13. July 2021, 23:09) | 54 | 99 % |
| Primetime (Mystery Killer) by Mad-Tyas (on 11. August 2021, 00:14) | 26 | 96 % |
