(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 | |
|---|---|---|---|
 | Liar Sum Before Digit 9 #1 by Playmaker6174 (on 2. April 2023, 13:07) | 17 |  93 % |
| Nansuke Sudoku (formerly Word Search Sudoku) by ufdigga (on 13. April 2023, 23:21) | 18 | 97 % |
| Summer Snakes by yttrio (on 25. August 2023, 22:28) | 56 | 97 % |
| Squishy Deconstruction by Oddlyeven (on 8. June 2024, 14:52) | 17 | 95 % |
| Mystery Killer by Phistomefel (on 22. July 2020, 20:43) | 98 | 93 % |
| Chaos Construction: Ariadne's Pet Dinosaur by Myxo (on 24. June 2023, 13:08) | 94 | 94 % |
| Osaka (Killer) by Florian Wortmann (on 3. July 2022, 17:14) | 58 | 99 % |
| The Hare and the Tortoise by ThePedallingPianist (on 12. September 2024, 04:52) | 93 | 96 % |
| Angebranntes Kropki by Luigi (on 12. May 2011, 14:55) | 34 | 91 % |
| All Things Being Equal by actinide (on 6. August 2022, 14:59) | 39 | 95 % |
| Foggy Loop (FOW) by antiknight (on 28. August 2023, 04:47) | 119 | 92 % |
| Wichtelkalender 2013 – September by Susie (on 1. September 2013, 00:00) | 39 | 90 % |
| Semi-miraculous Sudoku by clover (on 26. September 2020, 13:00) | 45 | 93 % |
| Trisection by jsmirob (on 15. February 2022, 22:39) | 20 | 92 % |
| Fifth Floor Penthouses by SSG (on 8. July 2022, 07:32) | 21 | 91 % |
| Palette Paradise by siron2133 (on 2. September 2022, 18:37) | 20 | 97 % |
| Amphiboly by SSG (on 14. October 2022, 05:42) | 18 | 100 % |
| The blue square by ademjaz (on 20. January 2023, 15:42) | 38 | 97 % |
| Double U is actually an S by ademjaz (on 28. February 2023, 00:08) | 21 | 92 % |
| 89 Years After 2015 by LittleNightmaresLady (on 12. April 2023, 18:04) | 19 | 97 % |
