(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 | |
|---|---|---|---|
 | Guns of Icarus by PulverizingPancake (on 2. August 2024, 17:02) | 76 |  94 % |
| Ninth Court by Tyrgannus (on 28. October 2021, 13:36) | 50 | 96 % |
| Galactic Skirmish (Spiral Galaxy, Star Battle, Killer Sudoku) by AnalyticalNinja (on 1. February 2023, 02:21) | 90 | 95 % |
| Dropsies by RockyRoer (on 12. September 2020, 12:01) | 89 | 98 % |
| Juni Domino Monat (2) - Hochhausdomino by Richard (on 8. June 2012, 12:00) | 51 | 96 % |
| Pebbles (Ambiguous XV/kropki pairs sudoku) by Qodec (on 13. August 2023, 11:59) | 54 | 92 % |
| Shapes without Shapes by zetamath (on 2. March 2021, 04:28) | 41 | 94 % |
| Mind the Gap (Arrow X Sudoku) by tallcat (on 28. April 2021, 02:08) | 40 | 94 % |
| 3 Snakes 2 Puzzles by the_cogito (on 19. June 2022, 18:41) | 51 | 93 % |
| Little Talks 2 by djorr (on 8. August 2022, 14:00) | 19 | 93 % |
| Ring Of Entropy by crispy16 (on 7. September 2022, 15:56) | 22 | 98 % |
| Dragon Ball Soup by meggen033 (on 18. May 2023, 08:10) | 20 | 90 % |
| Order Crossing (ft. Nordy) by damasosos92 (on 22. August 2023, 17:39) | 21 | 97 % |
| Jello by zetamath (on 1. October 2023, 15:25) | 80 | 93 % |
| Prime Pairings by MSDOS (on 1. June 2024, 09:33) | 17 | 93 % |
| Hallways & Corridors (Between Numbered Rooms) by tallcat (on 16. September 2024, 21:27) | 78 | 92 % |
| Pünktchen Sudoku 4 by Richard (on 6. June 2009, 23:46) | 139 | 90 % |
| Ignition! (Thermo) by Blashyrkh (on 19. October 2024, 14:41) | 106 | 93 % |
| Wichtel 2016 (5): Stallungen am Nordpol by wichtel (on 12. June 2017, 22:00) | 33 | 96 % |
| Icarus by Fool on Hill (on 24. August 2023, 20:47) | 48 | 93 % |
