(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 | |
|---|---|---|---|
 | Eine Koralle by matter (on 24. May 2015, 08:51) | 28 |  93 % |
| Extreme Lunchbox by Undar_Beyond (on 15. May 2020, 20:32) | 32 | 90 % |
| 2d Wave Particles by zetamath (on 15. July 2021, 18:22) | 27 | 95 % |
| Triple Decker by Mimaamakim (on 29. August 2021, 20:28) | 30 | 98 % |
| Teenage Dream by starwarigami (on 6. September 2022, 07:37) | 55 | 97 % |
| Cryptic Coin (Arrow Kropki Sudoku) (ft. Tyrgannus) by Agent (on 9. September 2022, 09:00) | 60 | 98 % |
| Anti Minesweeper Chaos by Polycarp (on 29. April 2023, 20:24) | 28 | 93 % |
| Maelstrom by MavericksJD (on 2. June 2023, 02:07) | 27 | 91 % |
| Fishnet by TotallyNormalCat (on 22. February 2022, 02:30) | 83 | 97 % |
| Vignettes by zetamath (on 18. July 2022, 00:54) | 75 | 99 % |
| Fillomino-ish Killer Sudoku by SirWoezel (on 25. November 2020, 16:21) | 53 | 99 % |
| Sunflower by RockyRoer (on 22. September 2021, 19:20) | 52 | 96 % |
| Three of Diamonds by zetamath (on 20. February 2023, 16:07) | 50 | 93 % |
| Pointed Chaos by yttrio (on 30. June 2023, 20:03) | 93 | 98 % |
| Venn Diagram Loops by Prof.Dori (on 9. May 2024, 16:44) | 43 | 100 % |
| Some Kind of Chaos by marty_sears (on 24. May 2024, 09:25) | 69 | 97 % |
| Wichtel 2015 (12 und Schluss): Hommage an eine Künstlerin by wichtel (on 18. July 2016, 21:50) | 32 | 96 % |
| WPC 2016 Training - Pentominos by uvo (on 12. July 2017, 15:33) | 38 | 98 % |
| Nexus by udukos (on 12. June 2021, 01:00) | 40 | 98 % |
| Leapfrog by jovi_al (on 9. April 2022, 00:30) | 60 | 95 % |
