(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 | |
|---|---|---|---|
 | Verzwicktes ABCtje by ibag (on 23. October 2011, 09:42) | 21 |  93 % |
| Chaos Construction: Border Sums by kolot (on 1. February 2022, 17:06) | 77 | 99 % |
| Wichtel 2021 (6): Flucht durch die Unterwelt by wichtel (on 24. September 2022, 02:21) | 19 | 99 % |
| Does Phistomefel's Ring Still Apply? by bodemeister (on 23. February 2024, 08:43) | 23 | 99 % |
| Liar Japanese Sums #8 - Ciphered Deconstruction by Niverio (on 4. June 2024, 08:48) | 45 | 100 % |
| Irma Vep by mathpesto (on 16. April 2025, 17:22) | 40 | 97 % |
| alte karte / ferneiland by aqjhs (on 14. November 2025, 02:34) | 27 | 98 % |
| Elementary by Mad-Tyas (on 2. March 2026, 14:52) | 19 | 100 % |
| Roller Coaster Nurikabe by the_cogito (on 24. February 2023, 19:32) | 94 | 98 % |
| Overlarge by Jay Dyer (on 1. May 2023, 14:40) | 75 | 98 % |
| Country Road Fillomino #2 (12x14) by Jesper (on 25. October 2022, 08:02) | 51 | 100 % |
| Space Mountain by IcyFruit (on 1. December 2023, 22:12) | 33 | 97 % |
| The Great Overlap by filuta (on 2. February 2024, 16:27) | 29 | 98 % |
| Deconstructing Mysterious Little Killers by Jeet Sampat (on 26. February 2024, 16:07) | 33 | 96 % |
| Zum Geburtstag by Uhu (on 5. March 2017, 10:24) | 41 | 99 % |
| Crypto Japanese Cave with Indexers by KNT (on 20. October 2022, 06:39) | 57 | 100 % |
| Couples by kolot (on 28. July 2021, 14:07) | 31 | 94 % |
| Spaceships by antiknight (on 20. June 2022, 16:39) | 16 | 95 % |
| Chaotic Serpents by jsmirob (on 20. June 2022, 19:26) | 16 | 95 % |
| Fahrenheit's Vision by Xenonetix (on 11. July 2022, 22:22) | 54 | 99 % |
