(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 | |
|---|---|---|---|
 | Double Digit Drama by mormagli (on 21. February 2024, 06:25) | 22 |  99 % |
| Uneasy Alliances by ViKingPrime (on 30. May 2024, 16:00) | 20 | 93 % |
| Invasion! by Sotehr (on 27. October 2024, 00:00) | 18 | 96 % |
| Mini-Colossal Octoquadri III: Sukoro by sfushidahardy (on 11. June 2025, 17:52) | 32 | 100 % |
| Cambrian by Kafkapharnaum (on 2. October 2025, 21:23) | 24 | 100 % |
| The Legend Of Sudoku Hollow: First Encounters by MathGuy_12 (on 31. October 2025, 03:01) | 20 | 96 % |
| Counting Territories by masetab (on 17. January 2026, 14:33) | 25 | 97 % |
 | Copykabe by mellowrobinson (on 9. May 2026, 15:36) | 23 | 97 % |
| The Answer to the Ultimate Question by ViKingPrime (on 11. October 2024, 20:30) | 103 | 97 % |
| Coral Creek by Jay Dyer (on 17. June 2023, 01:07) | 52 | 97 % |
| Mayan Ruins (Run-on Renban) by riffclown (on 20. November 2023, 13:18) | 57 | 94 % |
| Gross Misconduct by marty_sears (on 20. July 2025, 01:00) | 225 | 97 % |
| X-Square Whispers by Cane_Puzzles (on 15. May 2022, 17:20) | 35 | 96 % |
| BYO RSL by mathpesto (on 5. November 2023, 15:55) | 34 | 94 % |
| Scalding torrent by NicoD (on 3. August 2025, 05:30) | 35 | 93 % |
| Hype Bday Spawn by aqjhs (on 18. February 2026, 23:23) | 28 | 92 % |
| Entropy Revival by Mad-Tyas (on 30. March 2026, 14:41) | 33 | 94 % |
| Dislocation by Ali M (on 26. July 2023, 22:58) | 80 | 93 % |
| Exclusion (Thermo Renban Sudoku) by Phistomefel (on 27. March 2023, 18:43) | 136 | 98 % |
| Roller Coaster mit Extras 3 by Uhu (on 20. January 2018, 12:49) | 63 | 98 % |
