(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 | |
|---|---|---|---|
 | Near Algodones (Full Rank Sudoku) by SamuPiano (on 11. August 2025, 15:44) | 28 |  96 % |
| Haphazard by NicoD (on 3. September 2025, 05:30) | 35 | 96 % |
| Mercury Arrows (Thermo Arrow) by tallcat (on 23. May 2021, 23:22) | 35 | 94 % |
| Mambo by zetamath (on 6. September 2024, 00:16) | 43 | 96 % |
| Anarchery by Kaktuslav (on 5. August 2025, 08:00) | 39 | 96 % |
| Six-pack Linked Sudokus #8 by Genomico (on 15. September 2021, 04:10) | 46 | 99 % |
| Pentomino Yajilin by KNT (on 31. May 2024, 20:24) | 98 | 99 % |
| RAT RUN 22: Copyrat by marty_sears (on 21. January 2026, 03:35) | 595 | 98 % |
| Rätselkombi by Luigi (on 19. July 2010, 13:10) | 60 | 94 % |
| Think Outside the Box by Frippe (on 8. April 2024, 20:33) | 80 | 92 % |
| More by TotallyNormalCat (on 4. September 2021, 22:30) | 81 | 98 % |
| Gerade Ungerade TaKo by tuace (on 22. March 2014, 10:30) | 45 | 98 % |
| Quintuple skyscrapers by zorant (on 6. December 2019, 12:20) | 30 | 95 % |
| Valve by Lisztes (on 12. June 2021, 01:00) | 34 | 93 % |
| Connections by TotallyNormalCat (on 6. June 2021, 23:00) | 33 | 99 % |
| Yes, The Clever Equation by SSG (on 28. September 2021, 07:07) | 31 | 95 % |
| Ranked Top 9 Best Digits (Rank Sudoku) by purpl (on 22. March 2022, 21:59) | 19 | 97 % |
| Farsight by sunnyjum (on 24. October 2022, 06:45) | 22 | 91 % |
| Aligned by Jagga (on 23. December 2022, 05:19) | 23 | 92 % |
| Big Mac by ademjaz (on 2. May 2023, 21:52) | 29 | 96 % |
