(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 | |
|---|---|---|---|
 | String Quartet by IcyFruit (on 5. November 2023, 01:26) | 81 |  95 % |
| Verrätselte Zahlenfolge by berni (on 30. March 2011, 21:27) | 31 | 97 % |
| Compass Sudoku by stephane.bura (on 16. July 2020, 14:54) | 27 | 96 % |
| Arrow Sudoku by PotatoHead21 (on 26. April 2021, 09:02) | 33 | 90 % |
| Fourteen Arrows by FryTheGuy (on 14. September 2021, 06:47) | 46 | 96 % |
| Pandemonium by Testarossa (on 19. September 2021, 11:11) | 19 | 95 % |
| Target Acquired (Equalines Sudoku) by Sktx (on 4. February 2023, 22:17) | 27 | 96 % |
| Purple vs Green (Entropy Sudoku) by Mad-Tyas (on 4. April 2023, 10:14) | 41 | 93 % |
| Serpents in the Shadows by XeonRisq (on 13. May 2023, 05:00) | 16 | 91 % |
| FMTC by Starstorm (on 20. June 2023, 21:21) | 27 | 93 % |
| Biloxi - a Beachcomber Sudoku by glum_hippo (on 23. November 2023, 02:00) | 23 | 98 % |
| Decoder [Akari Japanese Sums Fillomino] by wisty (on 25. December 2024, 15:31) | 26 | 99 % |
| Feeling Six Yet? by oskode (on 27. August 2025, 06:06) | 35 | 93 % |
| Beyond (Nurikabe Sudoku) by MaizeGator (on 15. July 2025, 20:10) | 88 | 97 % |
| Chaotic 3D Full Rank by SparkNights (on 23. August 2025, 09:03) | 20 | 98 % |
| A-Row & Z-Row by Scojo (on 25. October 2025, 02:22) | 27 | 99 % |
| Any NEWS? by SennyK (on 19. February 2026, 13:39) | 20 | 91 % |
| Figure 8 by antiknight (on 12. March 2026, 16:49) | 51 | 95 % |
| Some Kind of Chaos by marty_sears (on 24. May 2024, 09:25) | 152 | 98 % |
| Chaos Construction: Numbered Regions #2 by Jesper (on 2. October 2022, 15:14) | 94 | 100 % |
