(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 | |
|---|---|---|---|
 | Loses Kalenderblatt April 2015 by April (on 1. April 2015, 00:00) | 29 |  97 % |
| Boundless (Many Variants!) by Aaronomys (on 31. May 2021, 11:28) | 16 | 96 % |
| Minesweeper Sudoku by Niverio (on 24. November 2021, 23:53) | 43 | 98 % |
| Crossroad by Testarossa (on 18. January 2022, 20:44) | 33 | 94 % |
| Linked Lists by Innocuous (on 22. September 2022, 19:42) | 18 | 90 % |
| Jigsaw-doku by jwsinclair (on 3. October 2022, 20:31) | 28 | 98 % |
| Disoriented (Chaos Construction) by Agent (on 3. January 2023, 09:00) | 59 | 99 % |
| MP: Region Sum Lines Fillomino by Myxo (on 28. January 2023, 14:28) | 45 | 97 % |
| Tree Of Dominos by Jobo (on 11. March 2023, 11:13) | 15 | 92 % |
| Lithium + Neon by 99%Sneaky (on 14. June 2023, 19:58) | 16 | 98 % |
| Diagonal Indexing #1 by EPH (on 5. August 2023, 02:41) | 21 | 92 % |
| Modular Mirror by RockyRoer (on 3. October 2023, 11:52) | 71 | 94 % |
| Project 37 by Blashyrkh (on 6. December 2023, 13:48) | 73 | 93 % |
| Edge Effects by arbitrary (on 9. March 2024, 03:50) | 18 | 94 % |
| Mysterious Puzzle Survey by Niverio (on 8. July 2024, 01:00) | 14 | 96 % |
| Kill Or Quads by MSDOS (on 12. July 2024, 08:26) | 72 | 92 % |
| Close Enough by MSDOS (on 3. August 2024, 05:51) | 21 | 92 % |
| Read between the lines by Lizzy01 (on 1. April 2025, 01:04) | 18 | 91 % |
| Killer Line Loop by mellowrobinson (on 12. June 2025, 08:04) | 16 | 94 % |
| U-Bahn (2) by KNT (on 15. April 2023, 06:02) | 56 | 99 % |
