(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 Rank by Andrewsarchus (on 5. November 2022, 17:39) | 17 |  98 % |
| Castle Wall / Yin-Yang #2 (13X13) by MagnusJosefsson (on 27. December 2022, 13:28) | 54 | 96 % |
| Anti-Knight Weirdity 5 by Jeet Sampat (on 25. February 2023, 20:19) | 55 | 94 % |
| Meidjuluk Star Battle by Grausbert (on 19. June 2023, 15:30) | 26 | 96 % |
| Renber Whispan #2 by Sktx (on 8. August 2023, 11:49) | 33 | 96 % |
| Excavation (arrows) by ZeroUltra (on 10. August 2023, 21:15) | 19 | 92 % |
| Ichidoku [Ichimaga/Sudoku Hybrid, Region Sum Lines] by Malrog (on 29. September 2023, 18:45) | 17 | 97 % |
| Horses are better in pairs by chameleon (on 12. April 2024, 11:47) | 32 | 94 % |
| Murder Holes (Chaos Construction) by kingoffries (on 1. July 2025, 23:03) | 24 | 100 % |
| Fold-In Hexuro by Nell Gwyn (on 30. October 2025, 04:09) | 17 | 93 % |
| Clockwork (Sum-Product Frame Sudoku) by Qodec (on 16. December 2025, 21:19) | 42 | 98 % |
| Denver by ICHTUES (on 17. July 2022, 06:00) | 123 | 96 % |
| Stostone Cold (Chaos Construction) by Phistomefel (on 10. April 2024, 20:09) | 103 | 97 % |
| Doppler Effect (Roller Coaster) by Agent (on 3. January 2024, 09:00) | 49 | 99 % |
| Covert Confinement by SSG (on 21. January 2022, 07:01) | 43 | 98 % |
| It's all about sharing by Emphyrio (on 3. February 2023, 17:50) | 39 | 97 % |
| Schrödinger 201: Reversing Time's Arrow by ViKingPrime (on 20. September 2023, 01:00) | 38 | 94 % |
| X-sum, but in Chaos by SparkNights (on 21. September 2023, 06:00) | 40 | 96 % |
| Lügner Rundwege - Liar Loops by Calavera (on 17. November 2009, 19:32) | 63 | 97 % |
| Primesweeper Sudoku by SenatorGronk (on 23. June 2020, 01:30) | 36 | 93 % |
