(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 | |
|---|---|---|---|
 | The Train and the Fly by marty_sears (on 16. August 2024, 11:13) | 108 |  95 % |
| Wichtel 2015 (9): Das Amulett by wichtel (on 6. June 2016, 15:20) | 35 | 97 % |
| Castle Wall / Masyu Liars by Agent (on 24. January 2023, 09:00) | 40 | 99 % |
| Road and River (Palindrome and Thermo-Region Sum Line) by BenTen (on 26. May 2023, 00:35) | 46 | 93 % |
| Veiled Minima (FOW) by antiknight (on 5. February 2026, 09:26) | 52 | 91 % |
| German Whispers Sandwich Sudoku by Jesper (on 4. July 2020, 11:47) | 82 | 96 % |
| Prismatic Palindromes by Scojo (on 19. November 2024, 01:10) | 122 | 97 % |
| Toroidal Chess Sudoku #2 by Rotstein (on 7. June 2020, 20:24) | 26 | 92 % |
| 2X45 by Lisztes (on 22. October 2021, 01:00) | 28 | 92 % |
| WYSI by brandon_bot (on 18. June 2021, 07:27) | 28 | 94 % |
| Instructionless by Jesper (on 8. December 2021, 09:27) | 66 | 97 % |
| Transfer by Emphyrio (on 15. March 2022, 03:06) | 46 | 97 % |
| Sandbox Mode [Irregular RSL Sudoku] by wisty (on 24. May 2022, 17:36) | 24 | 91 % |
| Zahlen nach Malen / Numbers by paint by olima (on 10. June 2022, 16:16) | 22 | 93 % |
| Go Kart Race by zegres (on 12. September 2023, 08:19) | 47 | 91 % |
| Thermal Counting Quads by MSDOS (on 28. June 2024, 02:51) | 33 | 94 % |
| We Have Palindromes at Home by Kafkapharnaum (on 7. July 2024, 07:13) | 22 | 92 % |
| Polyrhythm (Mod-length Index Lines) by DubiousMobius (on 27. February 2025, 23:27) | 27 | 92 % |
| Battle With The Archers 16: Judgment Trio by Playmaker6174 (on 17. September 2021, 12:12) | 58 | 96 % |
| XY-Differences Fillomino by glum_hippo (on 21. August 2023, 01:39) | 58 | 97 % |
