(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 | |
|---|---|---|---|
 | Coprime Directive by cristophermoore (on 12. March 2021, 07:20) | 17 |  93 % |
| Daffodil by jovi_al (on 15. April 2021, 22:57) | 66 | 95 % |
| Friendly Sums by Jay Dyer (on 30. December 2021, 21:31) | 15 | 95 % |
| Stay Outside by EricRathbun (on 5. May 2022, 00:03) | 20 | 94 % |
| Code 62 (Hi-five) (Sudoku 22) by Sumanta(ANU) (on 11. April 2022, 13:35) | 39 | 96 % |
| Toothbrushes by krangune (on 8. May 2022, 12:49) | 36 | 97 % |
| Proximity by XeonRisq (on 4. June 2022, 23:00) | 15 | 98 % |
| Merry Camel to you! by panthchesh (on 19. December 2022, 19:30) | 22 | 91 % |
| Should I Goodliffe The Thermo? by GBPack (on 4. April 2023, 01:18) | 20 | 95 % |
| U-Bahn (1) by KNT (on 15. April 2023, 06:02) | 68 | 97 % |
| Cross-functional arrows by arbitrary (on 31. March 2024, 14:56) | 19 | 90 % |
| Zeros and Negatives Don’t Mix (0-9 Challenge) by The Bard (on 1. August 2024, 23:40) | 25 | 91 % |
| [TSL][S1T1] Red is innocent by ademjaz (on 13. October 2024, 18:00) | 15 | 93 % |
| Breaking the Cycle [Slingshot] by 3good5you (on 28. January 2025, 19:55) | 18 | 98 % |
| [TSL][S1T3] Chiaroscuro / Snake Egg Permaculture by yttrio (on 1. March 2025, 02:11) | 17 | 95 % |
| Fillomino 71 - Dedicated to Myxo by damasosos92 (on 23. August 2025, 19:52) | 17 | 98 % |
| Wichtelkalender 2012 (12) und Schluss by wichtel (on 1. December 2012, 09:00) | 60 | 95 % |
| REDRUM by grkles (on 5. April 2021, 16:26) | 64 | 98 % |
| Black and White Cookie by pieguy (on 16. September 2023, 02:41) | 63 | 94 % |
| Same Difference by marty_sears (on 9. October 2023, 13:18) | 115 | 97 % |
