(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 | |
|---|---|---|---|
 | Search Nine Sandwiches by RockyRoer (on 10. August 2023, 05:22) | 24 |  95 % |
| Corners and Sum Lines by Jolly Rogers (on 7. March 2024, 22:17) | 54 | 95 % |
| Say, What Do Little Killers Eat? by RockyRoer (on 25. July 2024, 20:18) | 23 | 93 % |
| The Nine Hells by 10feet (on 5. September 2025, 22:26) | 25 | 90 % |
| Metope (Chaos Construction) by tallcat (on 9. December 2023, 08:00) | 137 | 97 % |
| Position Sums (9x9 Chaos Construction) by ONeill (on 18. October 2022, 16:45) | 54 | 100 % |
| Rod of Eternal Coherence by Playmaker6174 (on 6. July 2025, 04:00) | 117 | 98 % |
| 14 Standards by JonaS2010 (on 1. April 2020, 14:14) | 142 | 93 % |
| 24 Rätsel in 24 Stunden (Teil 7) - Rundweg by Zzzyxas (on 24. June 2017, 06:24) | 79 | 90 % |
| 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 % |
| Back & Forth by fjam (on 29. September 2022, 13:52) | 47 | 93 % |
| Heat Flow by Mad-Tyas (on 8. November 2022, 09:18) | 58 | 95 % |
| Prime Management by Dr Logic (on 21. December 2023, 16:43) | 22 | 91 % |
| Route 5 (Instructionless) by Agent (on 16. January 2024, 09:00) | 51 | 100 % |
| Omaha by zetamath (on 21. June 2024, 04:57) | 46 | 96 % |
