(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 | |
|---|---|---|---|
 | Counting Thermos by Scojo (on 17. December 2023, 21:16) | 129 |  97 % |
| Line of Sight (9x9 Chaos Construction) by ONeill (on 22. October 2022, 02:01) | 58 | 99 % |
| Unzipped by marty_sears (on 30. October 2023, 00:41) | 56 | 97 % |
| Zodiac (Cipher Japanese Sums Deconstruction) by tallcat (on 6. May 2024, 08:00) | 51 | 94 % |
| Deconstructed Fog by DiMono (on 11. September 2024, 19:24) | 51 | 94 % |
| Double, Cross by Black_Doom (on 18. November 2024, 05:54) | 73 | 98 % |
| RiesenRenbanKropki II by Richard (on 9. April 2010, 12:00) | 68 | 91 % |
| Steckkisten (3) by BFaw (on 25. August 2013, 14:00) | 20 | 91 % |
| Wichtel 2018 (10): HaHeHiHoHoHu by wichtel (on 7. February 2020, 18:20) | 39 | 100 % |
| A Lying Stars Mystery Killer by Djmelee3000 (on 24. September 2020, 21:07) | 29 | 98 % |
| Position Sums (Odd-even coded) by Realshaggy (on 5. February 2021, 12:00) | 42 | 98 % |
| Reservation for Eight by apiyo (on 25. March 2021, 09:16) | 21 | 95 % |
| Multi-sudoku: Orb by DiMono (on 9. April 2021, 16:38) | 39 | 98 % |
| Eine Handvoll U-Bahnen (Teil 4) - Relationen by Zzzyxas (on 18. February 2022, 22:50) | 47 | 99 % |
| Shrek's Sums by twototenth (on 8. March 2022, 08:00) | 20 | 95 % |
| Fibonacci Fountain by Malrog (on 22. June 2022, 20:02) | 16 | 97 % |
| A Puzzle in Two Parts by jsmirob (on 12. December 2022, 05:58) | 82 | 95 % |
| Squeeze by JamesCullum (on 6. March 2023, 23:36) | 24 | 98 % |
| Consecutive Steps by Scruffamudda (on 5. April 2023, 08:20) | 43 | 94 % |
| Bloodsuckers by ViKingPrime (on 8. April 2023, 12:00) | 21 | 92 % |
