(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 | |
|---|---|---|---|
 | Thermosnakes by Nordy (on 21. April 2022, 08:00) | 41 |  94 % |
| Riverbank - Episode 3: Watch on the Rhine by henrypijames (on 6. May 2022, 14:48) | 14 | 100 % |
| Übungsrätsel für die LM 2022: Bewegung bitte! by lupo (on 17. June 2022, 12:00) | 13 | 98 % |
| Paint by Numbers by ste221093 (on 19. August 2022, 19:59) | 13 | 91 % |
| Doublomania by lepton (on 3. January 2023, 21:14) | 28 | 98 % |
| Kropkikabe by MmeMagique (on 28. May 2023, 18:00) | 25 | 92 % |
| Jelly Beans by cristophermoore (on 6. July 2023, 04:10) | 12 | 95 % |
| Little Killer Sandwiches by Jreg (on 6. September 2023, 07:00) | 69 | 93 % |
| ☯ Yin-Yang-Loop ☯ by ElChiglia (on 1. April 2024, 00:17) | 31 | 93 % |
| Redundancies by vitaminz (on 29. April 2025, 22:25) | 14 | 93 % |
| Ren-Bahn #2 [Renban U-Bahn] by Christounet (on 6. September 2025, 16:46) | 25 | 99 % |
| Snowtropics 3 by SecondBlue (on 17. December 2025, 06:00) | 18 | 93 % |
| Five Fish by SXH (on 28. November 2024, 02:57) | 134 | 95 % |
| Daybreak (Antiknight Thermo Sudoku) by Playmaker6174 (on 11. October 2022, 04:47) | 97 | 98 % |
| Yin Yang Multi-thermos by yttrio (on 8. March 2024, 20:20) | 77 | 98 % |
| Dutch-pelgänger by ChinStrap (on 6. December 2025, 16:19) | 72 | 96 % |
| Brooklands (Doubler/Region Sum Line) by damo_89 (on 22. April 2025, 00:08) | 63 | 96 % |
| Bagels & Deli by ICHTUES (on 3. September 2023, 06:00) | 45 | 97 % |
| Giraffe Hunt 2 by ralphwaldo1 (on 24. October 2024, 22:08) | 58 | 90 % |
| Pierced Cages by Mark Sweep (on 29. January 2021, 10:00) | 36 | 94 % |
