(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 | |
|---|---|---|---|
 | 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 % |
| Tapa Mashup with Clones by Mark Sweep (on 25. February 2022, 10:00) | 34 | 98 % |
| Bounce by zetamath (on 25. April 2022, 16:17) | 53 | 99 % |
| Killer Sudomino (Killer Sudoku+Fillomino Hybrid) by AnalyticalNinja (on 31. October 2022, 14:08) | 48 | 98 % |
| A New Secret by blackjackfitz (on 6. February 2023, 19:05) | 15 | 98 % |
| Little Killer Irrwisch Sudoku by clover (on 23. December 2023, 15:53) | 15 | 92 % |
| Overdose by XeonRisq (on 20. February 2024, 23:00) | 29 | 91 % |
| Nuts and Bolts the Sequel: Mowing the Lawn by KMD (on 26. March 2024, 00:13) | 15 | 98 % |
| polyline polyglot by aqjhs (on 3. March 2025, 17:40) | 13 | 90 % |
| Impossible Germany by Neokart (on 28. October 2024, 02:41) | 31 | 96 % |
| Reciproci-Pea by vitaminz (on 11. July 2025, 15:43) | 17 | 94 % |
| Forbidden Desert (Pathfinding) by damo_89 (on 11. September 2025, 23:34) | 13 | 96 % |
| Privy (German Whispers/Renban/Sandwich) by dumediat (on 24. April 2023, 14:06) | 61 | 95 % |
| Chaos Construction - Oenopion's Return by Niverio (on 31. May 2023, 22:18) | 100 | 97 % |
| Double, Double by zetamath (on 13. August 2022, 22:07) | 88 | 97 % |
| Killer Numbered Rooms by the_cogito (on 21. March 2023, 21:04) | 38 | 95 % |
| Hakyuu-Hitori Kombi by pwahs (on 28. June 2011, 11:36) | 49 | 97 % |
| Vers la Flamme by Piatato (on 17. May 2021, 20:39) | 46 | 95 % |
| Bolts by antiknight (on 28. March 2023, 14:49) | 31 | 96 % |
