(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 | |
|---|---|---|---|
 | Four body problem by filuta (on 21. November 2021, 18:11) | 14 |  92 % |
| Exactly Eighty by krangune (on 23. January 2022, 17:08) | 52 | 97 % |
| Frak by zetamath (on 20. February 2022, 21:09) | 75 | 98 % |
| Chaosandwich by grkles (on 11. April 2022, 19:24) | 82 | 100 % |
| Biagonal Bichael (Chaos Construction) by purpl (on 29. May 2022, 17:32) | 38 | 98 % |
| The Unlikely Duos - A 6-pack Linked Sudokus Puzzle by Playmaker6174 (on 8. June 2022, 01:50) | 25 | 99 % |
| Coordinated Killers by Samish (on 11. September 2022, 09:09) | 63 | 96 % |
| Hook, Line and Sinker by SenatorGronk (on 29. September 2022, 00:21) | 20 | 92 % |
| Projections (Killer Parity) by tallcat (on 12. November 2022, 08:00) | 40 | 96 % |
| Parity Party XXIV, "Fast Times" by glum_hippo (on 30. November 2022, 17:14) | 20 | 96 % |
| Menagerie by SSG (on 13. December 2022, 07:14) | 28 | 95 % |
| Prison Party of Eight by lepton (on 10. January 2023, 18:59) | 21 | 94 % |
| Time by lerroyy (on 13. January 2023, 19:26) | 20 | 92 % |
| Symphony (Entropy Killer) by Mad-Tyas (on 6. February 2023, 08:28) | 39 | 97 % |
| O'Position [Ciphered Position Sums Fillomino] by Christounet (on 30. April 2023, 22:51) | 22 | 99 % |
| Thinking in Circles by Mennoo_ (on 22. June 2023, 11:34) | 23 | 93 % |
| Surgical Excision by HalfBakedLunatic (on 1. July 2023, 05:02) | 45 | 96 % |
| Locomotive by wooferzfg (on 20. July 2023, 20:28) | 33 | 96 % |
| Impossible Objects by tesseralis (on 8. September 2023, 07:40) | 40 | 98 % |
| Sandwich X Circles by ICHTUES (on 8. October 2023, 06:00) | 21 | 90 % |
