(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 | |
|---|---|---|---|
 | 2021 by RockyRoer (on 31. December 2020, 00:00) | 47 |  93 % |
| Coprime Directive by cristophermoore (on 12. March 2021, 07:20) | 17 | 93 % |
| Daffodil by jovi_al (on 15. April 2021, 22:57) | 65 | 95 % |
| Bethermoween Sudoku by Cane_Puzzles (on 30. April 2021, 18:00) | 18 | 91 % |
| Just Knights and Arrows by GBPack (on 18. November 2021, 21:53) | 19 | 90 % |
| Friendly Sums by Jay Dyer (on 30. December 2021, 21:31) | 15 | 95 % |
| Stay Outside by EricRathbun (on 5. May 2022, 00:03) | 19 | 94 % |
| 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 % |
| Mountain sandwich sudoku by Nylimb (on 12. February 2023, 23:01) | 15 | 96 % |
| Should I Goodliffe The Thermo? by GBPack (on 4. April 2023, 01:18) | 18 | 95 % |
| Hybrid Star Battle Series (020) - Shivers by BenceJoful (on 28. May 2023, 01:02) | 20 | 95 % |
| Shivirrwisches (Shivers/Irrwisch) by dumediat (on 14. August 2023, 13:50) | 15 | 100 % |
| Alphabet X-Sums by Scruffamudda (on 9. July 2024, 11:28) | 16 | 92 % |
| Zeros and Negatives Don’t Mix (0-9 Challenge) by The Bard (on 1. August 2024, 23:40) | 20 | 91 % |
| [TSL][S1T1] Red is innocent by ademjaz (on 13. October 2024, 18:00) | 14 | 93 % |
| Jam Packed Thick Crust Club Sandwich by sfushidahardy (on 13. February 2025, 00:43) | 16 | 95 % |
| 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 % |
| The Secret Meeting In Italy (German Whisper + XV) by Playmaker6174 (on 17. May 2023, 09:01) | 71 | 94 % |
