(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 | |
|---|---|---|---|
 | how many entropea puzzles can they be? by aqjhs (on 14. July 2025, 02:13) | 33 |  95 % |
| Rätselwochenende 2013: Rätselkreis by pwahs (on 13. March 2013, 18:30) | 60 | 99 % |
| Infrared [Sum Detector Fillomino] by MicroStudy (on 24. March 2023, 20:45) | 57 | 100 % |
| Herringbone by Qodec (on 26. October 2021, 18:02) | 92 | 99 % |
| Summenbild-Rundwegrätsel (2) by Uhu (on 22. November 2020, 19:13) | 28 | 97 % |
| Sudoku Variants Series (326) - Odd-Even Sandwich Sudoku by Richard (on 23. June 2021, 00:00) | 60 | 94 % |
| It being a weekend...(Disjoint Arrows Sudoku) by glum_hippo (on 15. August 2021, 05:00) | 34 | 96 % |
| Effluence by glum_hippo (on 20. August 2022, 17:08) | 34 | 94 % |
| California Mountain Snake (Yin Yang Sudoku) by Video Floral (on 9. October 2022, 13:58) | 61 | 95 % |
| Hex-Proof by qoala (on 6. February 2023, 00:15) | 36 | 95 % |
| Second Look (Killer/Look-and-say cages) by AnalyticalNinja (on 12. June 2023, 23:12) | 31 | 95 % |
| Portal X-sums by Playmaker6174 (on 3. October 2023, 00:01) | 29 | 96 % |
| Lucky Break by Lulero (on 8. February 2024, 11:22) | 33 | 95 % |
| Rätselquadrat by usp (on 7. July 2014, 00:00) | 58 | 99 % |
| [Fog of War Series] 3. Jumpgate Portals by AstralSky (on 28. October 2022, 05:51) | 75 | 92 % |
| The Right Distance by Kaktuslav (on 20. November 2025, 08:00) | 59 | 98 % |
| Counting Castles by marty_sears (on 18. February 2024, 03:37) | 228 | 97 % |
| Kongruenz-Rundweg mit Renban-Gruppen by ibag (on 21. March 2010, 19:43) | 31 | 90 % |
| Zeichenrundweg (4) by BFaw (on 30. June 2015, 09:00) | 28 | 93 % |
| Cryptic Battlefield Sudoku by Jesper (on 18. July 2020, 19:57) | 27 | 99 % |
