(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 | |
|---|---|---|---|
 | Heavy Ominoes by Jay Dyer (on 19. May 2024, 23:48) | 49 |  97 % |
| Matching by kolot (on 15. November 2021, 05:22) | 88 | 98 % |
| Suspicious Dwarf by Myxo (on 22. March 2023, 13:34) | 89 | 94 % |
| Kropki Indicator Sudoku by udukos (on 4. December 2020, 14:02) | 23 | 97 % |
| 007 - Licence to Kill by Kafkapharnaum (on 25. March 2021, 19:45) | 25 | 97 % |
| Eleven Arrows by EliasKar (on 3. April 2021, 07:44) | 42 | 97 % |
| Arrow Galore by SudokuExplorer (on 13. July 2021, 19:15) | 42 | 96 % |
| The Incomplete Diamond by Niverio (on 14. July 2021, 15:19) | 42 | 96 % |
| Consecutive Sums Sudoku by SudokuExplorer (on 21. October 2021, 22:15) | 39 | 99 % |
| Cliffs of Insanity by DarthParadox (on 27. June 2022, 00:06) | 22 | 93 % |
| Death Spiral by EricRathbun (on 4. February 2023, 18:12) | 28 | 94 % |
| 27 Killer by Florian Wortmann (on 26. February 2023, 13:14) | 90 | 96 % |
| Efflorescence [Arrows, Killer] by 3good5you (on 29. May 2024, 00:56) | 30 | 95 % |
| Copycat Blues (Collab with Marty Sears) by Scojo (on 20. July 2024, 06:28) | 22 | 91 % |
| Zodiac Project: Isolation by vitaminz (on 5. February 2025, 22:41) | 46 | 95 % |
| SET by ICHTUES (on 16. March 2025, 06:00) | 44 | 95 % |
| Easy as RBC - Arrows and Renbans by Laake (on 10. June 2025, 11:59) | 43 | 96 % |
| Former VP of Chaos Dancing (chaos construction) by sanabas (on 3. May 2026, 15:04) | 46 | 92 % |
| Foggy Expeadition by SamuPiano (on 14. June 2025, 15:44) | 114 | 96 % |
| Sacrifission Lambda (Sudokuvania boss) by SkepticalMario (on 13. June 2025, 07:00) | 88 | 91 % |
