(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 | |
|---|---|---|---|
 | Klein aber Fies: Jigsaw Killer by Richard (on 5. March 2010, 12:00) | 68 |  91 % |
| Tapa III by yureklis (on 24. March 2010, 22:44) | 89 | 94 % |
| Word Search Sudoku by Stavros96 (on 30. November 2020, 10:06) | 17 | 98 % |
| Checkmate Sudoku by SenatorGronk (on 21. December 2020, 16:26) | 19 | 94 % |
| Nori Nori Killer Sudoku by MavericksJD (on 29. November 2021, 02:22) | 15 | 94 % |
| Serial Locks by twototenth (on 7. December 2021, 12:46) | 14 | 90 % |
| Beacon Lighthouse (Chaos Construction - Phistomefel Tribute) by purpl (on 12. December 2021, 21:38) | 14 | 92 % |
| Berserk (slow thermo + german whispers sudoku) by Aspartagcus (on 18. March 2022, 21:28) | 19 | 92 % |
| WheelbArrows by Mountainfarmer (on 18. August 2022, 10:47) | 19 | 98 % |
| Toroidal Region XY-Sums (Chaos Construction, 8x8) by thoughtbyte (on 15. September 2022, 00:11) | 20 | 98 % |
| Ravine by Jay Dyer (on 21. January 2023, 23:55) | 81 | 96 % |
| Half-Life² by ViKingPrime (on 10. February 2023, 15:32) | 13 | 96 % |
| Difference by mormagli (on 4. March 2023, 05:59) | 14 | 100 % |
| Alfonso and Lori by zetamath (on 26. March 2023, 15:51) | 70 | 95 % |
| Always on the loockout ! [Lockout Lines Deconstruction] by Christounet (on 12. August 2023, 00:09) | 45 | 99 % |
| Star Killer Part 3: Lunch Break by FischmitFahrrad (on 5. January 2024, 20:00) | 17 | 96 % |
| Star Killer Part 5: Hull Breach by FischmitFahrrad (on 7. January 2024, 20:00) | 18 | 98 % |
| It's a Non-Factor by SSG (on 26. October 2023, 09:24) | 49 | 96 % |
| Smoke and Mirrors by gdc (on 22. February 2024, 20:05) | 38 | 90 % |
| The King's Archers by Lizzy01 (on 16. May 2024, 16:00) | 61 | 92 % |
