(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 | |
|---|---|---|---|
 | 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 % |
| Close Enough by MSDOS (on 3. August 2024, 05:51) | 20 | 92 % |
| Read between the lines by Lizzy01 (on 1. April 2025, 01:04) | 17 | 91 % |
| Killer Line Loop by mellowrobinson (on 12. June 2025, 08:04) | 16 | 94 % |
| Foundations by Andrewsarchus (on 20. June 2025, 22:13) | 33 | 96 % |
| U-Bahn (2) by KNT (on 15. April 2023, 06:02) | 56 | 99 % |
| Whispering Skyscrapers by Florian Wortmann (on 9. January 2022, 13:22) | 44 | 91 % |
| Chaos Construction: Sightlines by Jay Dyer (on 5. March 2022, 16:15) | 75 | 98 % |
| Weighted Cells by Oddlyeven (on 12. November 2024, 19:55) | 89 | 97 % |
| Offset by Nordy (on 11. March 2025, 08:30) | 42 | 93 % |
| When It's Time To Parity We Will Parity Hard (with Calvinball) by ChinStrap (on 24. April 2025, 13:16) | 84 | 96 % |
| Snake Egg Sudoku by Phistomefel (on 31. May 2020, 00:19) | 113 | 98 % |
| Circles and Thermos by stimim (on 9. September 2023, 19:28) | 115 | 96 % |
