(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 | |
|---|---|---|---|
 | Zodiac Project: Suguru's Surge by gdc (on 27. June 2024, 15:42) | 95 |  97 % |
| Liar Japanese Sums #1 by Niverio (on 21. December 2022, 18:27) | 84 | 99 % |
| From pillar to post - (Killer, Diagonal sudoku) by Mr.Menace (on 30. November 2023, 19:48) | 90 | 95 % |
| Quadrarrows by Jay Dyer (on 11. May 2024, 23:02) | 79 | 97 % |
| Pentomino-Rundreise by Phistomefel (on 16. August 2020, 00:23) | 72 | 99 % |
| Schrödinger Somedoku by gdc (on 7. May 2024, 12:35) | 73 | 99 % |
| Liar Spiral by Niverio (on 29. May 2022, 13:01) | 68 | 97 % |
| Tilt-a-Whirl by zetamath (on 17. October 2023, 17:38) | 70 | 92 % |
| 123...9 by Qodec (on 28. February 2021, 14:48) | 63 | 95 % |
| Switchy by ICHTUES (on 11. December 2022, 06:00) | 66 | 95 % |
| Entropy RSL by Mad-Tyas (on 2. May 2023, 09:02) | 63 | 96 % |
| Chaos Construction: Split Killers by XeonRisq (on 14. August 2022, 05:00) | 63 | 95 % |
| That’s Even Better (Little Killer, Kropki Sudoku) by Mr.Menace (on 5. November 2024, 18:34) | 69 | 96 % |
| California Mountain Snake (Yin Yang Sudoku) by Video Floral (on 9. October 2022, 13:58) | 58 | 95 % |
| Reverb (Killer) by dumediat (on 9. October 2023, 23:11) | 57 | 97 % |
| What Lies Beyond the Fog by ViKingPrime (on 20. December 2023, 21:45) | 139 | 95 % |
| Kakuro Series 4: Kakuro (Gapped) by Puzzle_Maestro (on 12. May 2020, 13:00) | 56 | 97 % |
| A Hundred Cells of Chaos by Big Tiger (on 1. August 2023, 01:49) | 53 | 98 % |
| Sudoku Variants Series (326) - Odd-Even Sandwich Sudoku by Richard (on 23. June 2021, 00:00) | 55 | 93 % |
| Not too High, Not too Low by Cane_Puzzles (on 18. March 2023, 19:57) | 56 | 96 % |
