(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 | |
|---|---|---|---|
 | Category 5 Hurricane by Polycarp (on 14. July 2021, 20:14) | 15 |  90 % |
| Broken Bow (Disjoint Arrow) by tallcat (on 2. August 2021, 21:46) | 29 | 93 % |
| Big Purple Creature by PulverizingPancake (on 6. August 2021, 06:46) | 26 | 94 % |
| Palindrome Killer 101 by Cane_Puzzles (on 8. August 2021, 19:01) | 25 | 91 % |
| Firefly by SSG (on 11. August 2021, 07:07) | 16 | 91 % |
| The Locked Chain - can you break the chain? by purpl (on 23. August 2021, 17:25) | 35 | 98 % |
| Roller Coaster mit Extras 23 by Uhu (on 27. August 2021, 22:18) | 30 | 99 % |
| Parity Party XXI, "aPProXimat" by glum_hippo (on 12. September 2021, 23:59) | 18 | 96 % |
| In or Out? (Between Lockout Ambiguity) by tallcat (on 1. October 2021, 16:33) | 46 | 99 % |
| 5K 5A by Joseph nehme (on 15. October 2021, 15:11) | 38 | 97 % |
| Mut by ICHTUES (on 31. October 2021, 06:00) | 38 | 92 % |
| X12 Cages by Quarterthru (on 1. November 2021, 06:02) | 21 | 92 % |
| A Shot in the Dark (Whisper Arrow) by tallcat (on 11. November 2021, 15:28) | 44 | 98 % |
| Superfuzzy Arrows 2 by Realshaggy (on 19. November 2021, 07:05) | 28 | 95 % |
| Triplets by jovi_al (on 22. November 2021, 22:32) | 43 | 92 % |
| Eine Handvoll U-Bahnen (Teil 5) - Standard by Zzzyxas (on 18. February 2022, 22:50) | 41 | 99 % |
| 12/24 by timp1343 (on 24. December 2021, 06:24) | 15 | 94 % |
| Parity-Linked Fillomino & Slitherlink by SudokuExplorer (on 30. December 2021, 00:00) | 29 | 96 % |
| Violet Owl by Tyrgannus (on 18. January 2022, 17:06) | 46 | 96 % |
| Sauron's Demise by XeonRisq (on 19. January 2022, 04:00) | 18 | 92 % |
