(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 | |
|---|---|---|---|
 | Haywire by mathpesto (on 5. September 2024, 22:21) | 47 |  97 % |
| Glückwünsche vom Orion by Statistica (on 9. July 2019, 00:55) | 25 | 100 % |
| Antiknight Killer Sudoku 2 by PotatoHead21 (on 6. November 2022, 01:25) | 32 | 91 % |
| Arrows by psninn (on 13. May 2024, 13:03) | 30 | 92 % |
| Near Algodones (Full Rank Sudoku) by SamuPiano (on 11. August 2025, 15:44) | 27 | 96 % |
| Haphazard by NicoD (on 3. September 2025, 05:30) | 34 | 96 % |
| Mercury Arrows (Thermo Arrow) by tallcat (on 23. May 2021, 23:22) | 35 | 94 % |
| Anarchery by Kaktuslav (on 5. August 2025, 08:00) | 39 | 96 % |
| Two Truths and a Different Truth by Oddlyeven (on 15. September 2025, 00:09) | 77 | 97 % |
| Rätselkombi by Luigi (on 19. July 2010, 13:10) | 60 | 94 % |
| Think Outside the Box by Frippe (on 8. April 2024, 20:33) | 79 | 92 % |
| More by TotallyNormalCat (on 4. September 2021, 22:30) | 81 | 98 % |
| Frankenstein by zetamath (on 10. June 2025, 20:50) | 84 | 95 % |
| Gross Misconduct by marty_sears (on 20. July 2025, 01:00) | 197 | 97 % |
| 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) | 33 | 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 % |
