(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 | |
|---|---|---|---|
 | Full Rank Sudoku by Gliperal (on 3. April 2023, 07:18) | 94 |  97 % |
| Toroidaler Kosmos by usp (on 27. February 2015, 00:00) | 23 | 92 % |
| Morgen ist Ostern by ibag (on 26. March 2016, 05:00) | 25 | 97 % |
| Bounce by zetamath (on 25. April 2022, 16:17) | 51 | 99 % |
| Wasteland [Landvermessung/Chaos Deconstruction] by zzw (on 16. April 2024, 13:26) | 25 | 95 % |
| AAAAAAAAA (Cipher Numbered Rooms) by tesseralis (on 8. July 2022, 10:06) | 35 | 94 % |
| Limitless Potential #1: Zero to Infinity by Playmaker6174 (on 23. April 2023, 09:53) | 39 | 98 % |
| Privy (German Whispers/Renban/Sandwich) by dumediat (on 24. April 2023, 14:06) | 57 | 95 % |
| First Rodeo (chaos construction) by jwsinclair (on 28. September 2024, 23:49) | 51 | 97 % |
| LM-Überbleibsel: Krypto-Teamrunde by uvo (on 28. November 2015, 10:00) | 75 | 99 % |
| Disjoint Whispers by abed hawila (on 5. October 2021, 10:47) | 15 | 94 % |
| Killer Sudoku #3 — 'Central Tendency' by PixelPlucker (on 2. January 2022, 05:59) | 43 | 97 % |
| Critical Mass (Renban Between Lines) by tallcat (on 13. March 2022, 21:18) | 62 | 97 % |
| Dust Storm by Gliperal (on 7. June 2022, 23:29) | 17 | 90 % |
| Killer Sudomino (Killer Sudoku+Fillomino Hybrid) by AnalyticalNinja (on 31. October 2022, 14:08) | 46 | 98 % |
| Galactic Aquariums (Spiral Galaxy Aquarium hybrid) by AnalyticalNinja (on 17. August 2023, 01:04) | 16 | 96 % |
| Between Friends by Die Hard (on 18. September 2023, 01:29) | 16 | 90 % |
| Overdose by XeonRisq (on 20. February 2024, 23:00) | 27 | 91 % |
| Mathrax Fillomino by Gliperal (on 28. November 2022, 01:44) | 39 | 95 % |
| Ophidiophobia by marty_sears (on 14. August 2024, 14:45) | 82 | 97 % |
