(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 | |
|---|---|---|---|
 | LM 2016 - Leftover: Yajilin by lupo (on 15. July 2016, 20:16) | 66 |  93 % |
| Killer Sudoku - Progress City by DiMono (on 14. September 2020, 01:27) | 65 | 97 % |
| Hungarian Tapa / Roller Coaster (1) by KNT (on 23. September 2022, 20:45) | 56 | 99 % |
| Wheel of Killers by Prof.Dori (on 19. September 2024, 17:32) | 59 | 92 % |
| XY-Differences Fillomino by glum_hippo (on 21. August 2023, 01:39) | 55 | 97 % |
| U-Bahn mit gemischten Hinweisen (Teil 1) by Zzzyxas (on 28. December 2019, 13:32) | 47 | 99 % |
| ♫ Slitherlink take me home ♫ by Phistomefel (on 1. April 2022, 01:04) | 53 | 99 % |
| Stuck In The Middle With You (Between Broken 159) by tallcat (on 15. January 2022, 00:11) | 48 | 98 % |
| Archery Zone by Ridhwan (on 3. June 2023, 18:16) | 59 | 97 % |
| Arrows Dilemma by Prof.Dori (on 14. August 2023, 16:02) | 52 | 94 % |
| Krypto-Kongruenz-Rundweg (2) by ibag (on 6. September 2009, 18:31) | 45 | 94 % |
| Thermollominologically (Fillomino/Thermo) by dumediat (on 12. January 2023, 00:00) | 52 | 94 % |
| Sextuple by Blashyrkh (on 24. July 2023, 12:36) | 46 | 93 % |
| Chaotic Sandwiches (Entropy Special) by Mad-Tyas (on 2. January 2022, 21:29) | 41 | 96 % |
| Kakuro-Koralle by ibag (on 5. September 2013, 23:55) | 74 | 96 % |
| Knightmare on Mount Pleasant Avenue by HalfBakedLunatic (on 25. March 2024, 22:21) | 88 | 94 % |
| Erster Pfeilchenstrauß by glum_hippo (on 16. August 2020, 09:33) | 43 | 95 % |
| Region X-Sums by twototenth (on 4. October 2022, 08:00) | 38 | 92 % |
| High Winds (Arrow Sudoku) by Agent (on 16. May 2021, 09:00) | 32 | 95 % |
| SAT Sudoku (Quads and Anti-Quads) by RockyRoer (on 27. August 2021, 13:00) | 75 | 97 % |
