(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 | |
|---|---|---|---|
 | Perfectly Balanced by IcyFruit (on 13. February 2025, 14:33) | 87 |  97 % |
| Thorny Tie (Killer Deconstruction) by Agent (on 12. July 2022, 09:00) | 62 | 100 % |
| Tír na nÓg by Qodec (on 17. July 2022, 10:20) | 68 | 98 % |
| Modular Fillomino by mathpesto (on 16. November 2024, 03:08) | 107 | 98 % |
| Everything Is Rihgt by DiMono (on 30. September 2022, 03:03) | 95 | 95 % |
| Clock Faces Sudoku by Phistomefel (on 21. August 2020, 16:50) | 41 | 93 % |
| Killer Sudoku - Twirl by Phistomefel (on 6. December 2020, 11:18) | 78 | 98 % |
| Castle Wall/Cave #2 by MagnusJosefsson (on 28. May 2021, 10:02) | 36 | 98 % |
| Advanced Kinematics (Projected Sum Arrow) by tallcat (on 6. April 2022, 20:08) | 39 | 90 % |
| Perforate by Xendari (on 14. July 2022, 08:22) | 38 | 98 % |
| Yozzy by zetamath (on 6. May 2024, 02:28) | 42 | 95 % |
| Counting Circles in Circles by egubachu (on 16. April 2025, 04:43) | 40 | 94 % |
| Fishnet by TotallyNormalCat (on 22. February 2022, 02:30) | 94 | 97 % |
| Squares and Circles by Burning Curtains (on 15. August 2021, 20:17) | 43 | 98 % |
| Schadenfreude by Andrewsarchus (on 11. September 2025, 23:51) | 29 | 100 % |
| Arrows Usually Include Low Digits by Md88keys (on 2. December 2025, 01:11) | 75 | 95 % |
| Sunflower by RockyRoer (on 22. September 2021, 19:20) | 59 | 96 % |
| Confined Sandwich Chaos by PrimeWeasel (on 6. July 2022, 16:55) | 56 | 97 % |
| Never (Yajilin/Sudoku) by Wessel Strijkstra (on 6. November 2022, 17:41) | 52 | 95 % |
| Fillomino Sudoku by spxtr (on 29. August 2020, 08:26) | 30 | 95 % |
