(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 | |
|---|---|---|---|
 | Orchid's Revenge by Abdul the Killer (on 1. October 2024, 12:34) | 91 |  96 % |
| Japanische Summen mit Pentominos by Uhu (on 19. July 2018, 22:22) | 61 | 98 % |
| Hochhaussummen-Sudoku [5] Killer by Errorandy (on 29. April 2020, 16:00) | 23 | 97 % |
| Lend Me Your Eyes by RockyRoer (on 17. November 2020, 01:46) | 23 | 97 % |
| Time capsule by Testarossa (on 22. September 2021, 15:41) | 24 | 93 % |
| Skyscrapers Sudoku by Qodec (on 11. December 2021, 11:33) | 69 | 92 % |
| Curvedoku by chameleon (on 1. July 2022, 13:23) | 25 | 100 % |
| Torque by randall (on 16. October 2022, 07:21) | 25 | 93 % |
| Ambiguous Little Killer + X-Sums Clues by Jeet Sampat (on 27. October 2022, 16:07) | 26 | 96 % |
| Limitless Potential #2: The Wanderer's Path by Playmaker6174 (on 12. May 2023, 16:49) | 23 | 95 % |
| Yin-Yang Thermos by Prof.Dori (on 10. October 2023, 17:23) | 48 | 94 % |
| Celebrating 100 by sujoyku (on 11. April 2024, 20:00) | 22 | 92 % |
| Bent Glass by arbitrary (on 12. May 2024, 13:00) | 51 | 94 % |
| Can I "borrow" some carrots? by SecondBlue (on 20. December 2024, 02:54) | 24 | 96 % |
| Rooftop enumerated hoagies by NicoD (on 27. March 2026, 05:30) | 22 | 94 % |
| RAT RUN 27: Productivity by marty_sears (on 25. February 2026, 01:01) | 520 | 98 % |
| Krypto - Tapa by Zzzyxas (on 2. May 2021, 16:29) | 51 | 99 % |
| 12 Arrows, 6 Rows by jovi_al (on 5. January 2022, 05:56) | 55 | 96 % |
| Japanisches Summen by berni (on 4. September 2015, 21:14) | 31 | 98 % |
| Adventssterne: Full Rank Star by Realshaggy (on 15. December 2019, 06:00) | 33 | 92 % |
