(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 | |
|---|---|---|---|
 | Productivity Killer by starwarigami (on 13. January 2024, 21:02) | 27 |  92 % |
| Chaos Construction: Disconnected (2) by KNT (on 20. May 2024, 04:09) | 87 | 98 % |
| Wichtel 2021 (2): Der Sternenkompass by wichtel (on 1. June 2022, 21:20) | 16 | 93 % |
| LM-Übungsrätsel: No Same Sums by CJK (on 1. July 2023, 20:23) | 16 | 96 % |
| Bluth's by mathpesto (on 21. May 2023, 03:08) | 46 | 96 % |
| Rank Up 06 - Fibonacci Squishtroquadri by ThePedallingPianist (on 14. July 2024, 01:08) | 47 | 98 % |
| Beispiel für Roller Coaster mit Extras 25 by Uhu (on 3. March 2022, 06:35) | 27 | 100 % |
| Spooky Action at a Distance by cygne (on 4. January 2026, 08:04) | 35 | 96 % |
| Urban Sprawl by jwsinclair (on 27. July 2022, 18:56) | 35 | 97 % |
| Doppelte Adventssummen 4. Advent by Luigi (on 20. December 2015, 08:04) | 52 | 96 % |
| Wichtel 2022 (7): Kryptisches Fillominurikabe by wichtel (on 11. October 2023, 14:14) | 13 | 95 % |
| upcoming upheaval by aqjhs (on 24. February 2025, 00:00) | 24 | 91 % |
| Cavernous Japanese Sum: Deconstruction (11x11) by Playmaker6174 (on 28. November 2025, 16:00) | 12 | 100 % |
| Counting Cages by plasmath (on 17. January 2026, 14:46) | 29 | 94 % |
| Armored Harriers by wooferzfg (on 30. April 2023, 06:06) | 29 |  96 % |
| The 15-Box Odyssey by Duarte-Carvalho (on 11. October 2025, 10:00) | 36 | 90 % |
| Killer Lunchboxes by Undar_Beyond (on 16. June 2020, 16:35) | 53 | 98 % |
| Mystery Box by Nahileon (on 2. August 2022, 22:09) | 34 | 92 % |
| Unter der Lupe (Instructionless) by Myxo (on 27. September 2023, 10:20) | 45 | 96 % |
| »Little Killer« unter Damen by glum_hippo (on 20. May 2020, 08:25) | 21 | 91 % |
