(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 | |
|---|---|---|---|
 | 15x15 Standard Pentominous by stefliew (on 28. March 2021, 08:46) | 39 |  99 % |
| Mysterious Lines 2: All WRAPT Up by mathpesto (on 26. September 2021, 17:25) | 32 | 95 % |
| Antiking Kaleidoscope (Stitched Rainbow VI) by thoughtbyte (on 7. August 2022, 03:16) | 40 | 97 % |
| Archer's Tale: The Roundtable by Playmaker6174 (on 7. October 2022, 11:26) | 37 | 97 % |
| Intertwined by siron2133 (on 29. October 2022, 11:34) | 37 | 91 % |
| Pigeonhole [Renban, Kropki] by Miky (on 26. March 2023, 10:21) | 72 | 91 % |
| Neon Neko by Senip (on 16. July 2023, 17:58) | 40 | 93 % |
| Lake Goldajärvi by EdTheAlchemist (on 26. December 2025, 13:58) | 41 | 97 % |
| Four Easy Pieces by Andrewsarchus (on 3. January 2026, 22:24) | 39 | 91 % |
| U-Bahn unter Hochhäusern (Teil 7) by Zzzyxas (on 5. May 2012, 18:21) | 54 | 99 % |
| Chaos Control by Scojo (on 15. April 2023, 01:59) | 60 | 94 % |
| Odd / Even Killer Sudoku (#1) by Mr.Menace (on 30. October 2020, 21:11) | 25 | 91 % |
| Little Killer by abed hawila (on 18. January 2021, 12:55) | 22 | 94 % |
| Sandwich Thermo Arrow Sudoku by Lizzy01 (on 9. May 2021, 20:17) | 24 | 90 % |
| Tic Tac Logic Sudoku by panthchesh (on 12. December 2021, 14:10) | 26 | 94 % |
| Battle With The Archers 36 - Dual Puzzles: Directional Intuition by Playmaker6174 (on 24. September 2022, 11:27) | 21 | 94 % |
| HeatTen Up by djorr (on 20. February 2023, 14:00) | 26 | 92 % |
| Yin Yang Arrows by yttrio (on 13. October 2023, 23:06) | 124 | 98 % |
| Fly Away on my Ziffer by DubiousMobius (on 7. August 2024, 11:54) | 22 | 97 % |
| Reversing Valve (Dynamic Fog Edition) by ViKingPrime (on 4. June 2025, 15:56) | 52 | 93 % |
