(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 | |
|---|---|---|---|
 | Rod of Eternal Coherence by Playmaker6174 (on 6. July 2025, 04:00) | 116 |  98 % |
| Differenzen zwischen Summen II by tuace (on 17. August 2018, 13:23) | 44 | 99 % |
| Amtsbeginn in Rätselhausen by Statistica (on 1. December 2019, 09:00) | 23 | 99 % |
| Cosmology by Bobuardo da Vinci (on 6. August 2020, 07:36) | 26 | 99 % |
| Udukos' breakfast by Qodec (on 14. October 2020, 20:49) | 28 | 95 % |
| Modular Killer by TotallyNormalCat (on 30. January 2021, 00:00) | 25 | 99 % |
| Numbered Rooms Sudoku 2 by Lizzy01 (on 4. January 2022, 22:03) | 52 | 91 % |
| Heat Flow by Mad-Tyas (on 8. November 2022, 09:18) | 58 | 95 % |
| Sub Zero Nabner by gdc (on 27. September 2023, 13:05) | 52 | 96 % |
| Prime Management by Dr Logic (on 21. December 2023, 16:43) | 22 | 91 % |
| Omaha by zetamath (on 21. June 2024, 04:57) | 46 | 96 % |
| obezyanka nol by aqjhs (on 30. August 2024, 08:07) | 26 | 95 % |
| Interlinked by oklux (on 8. January 2025, 11:11) | 30 | 94 % |
| top shelf 2% lactose free by aqjhs (on 14. June 2025, 16:59) | 21 | 93 % |
| Ça fait la rue Michel by Kjupatrick (on 10. December 2025, 15:46) | 25 | 91 % |
| quadcopter by arctan (on 28. January 2026, 09:50) | 90 | 91 % |
| Two Gates by Qodec (on 15. October 2021, 22:22) | 73 | 99 % |
| Tree(3) by PulverizingPancake (on 4. November 2021, 19:25) | 75 | 97 % |
| Die Kryptos - S02E02: A 38 by tuace (on 16. March 2018, 15:10) | 45 | 95 % |
| Ten Arrows (Classic Arrow Sudoku) by EliasKar (on 5. February 2021, 01:35) | 51 | 97 % |
