(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 | |
|---|---|---|---|
 | (Sudoku) Consecutive Decomposition by stimim (on 24. April 2021, 17:38) | 14 |  95 % |
| Count on Tetris by Florian Wortmann (on 2. May 2021, 12:55) | 27 | 93 % |
| Suburbs by grkles (on 29. July 2021, 03:00) | 24 | 94 % |
| The BremSter Thermo Conundrum by Zombie Hunter (on 16. September 2021, 00:25) | 17 | 93 % |
| Masyudoku by Testarossa (on 26. September 2021, 12:35) | 25 | 97 % |
| Flikk Flakk by PetLov (on 12. December 2021, 14:29) | 14 | 91 % |
| It's all math! by tenaliraman (on 20. January 2022, 19:04) | 12 | 95 % |
| Overfull by Jay Dyer (on 13. February 2022, 21:07) | 39 | 90 % |
| Dropped Kropkis by Dag H (on 27. May 2022, 10:49) | 13 | 90 % |
| A Quiet Place by Crusader175 (on 15. July 2022, 18:00) | 25 | 95 % |
| Code 9-12 (Sudoku31) by Sumanta(ANU) (on 18. July 2022, 15:39) | 31 | 92 % |
| Jellyfish by Nordy (on 11. February 2023, 08:00) | 15 | 91 % |
| Treasure Torus by RaygunUltra (on 19. May 2024, 05:16) | 12 | 93 % |
| Spirality by Nordy (on 6. June 2024, 08:30) | 16 | 91 % |
| Liar Japanese Sums: 48 Hour Special by SamuPiano (on 12. August 2024, 15:44) | 13 | 95 % |
| Fleece (Killer, X-Sums) by Chefofdeath (on 12. August 2024, 06:33) | 32 | 93 % |
| Hex Masyu with Branching by kiwijam (on 26. April 2013, 04:39) | 62 | 96 % |
| Which is Which, Again? by DJV (on 22. February 2023, 05:02) | 44 | 94 % |
| Antiknight-Killer Sudoku - Fortyfour by X13579 (on 16. June 2020, 10:28) | 62 | 93 % |
| Symmetry? by Qodec (on 13. April 2021, 20:16) | 76 | 91 % |
