(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 | |
|---|---|---|---|
 | Wichtel 2019 (3): Die U-Bahn unter dem Geschenkelager by wichtel (on 9. July 2020, 20:01) | 50 |  100 % |
| Between the Little Killers by Stavros96 (on 25. August 2020, 12:08) | 50 | 93 % |
| X-Sum Arrows by Phistomefel (on 29. December 2020, 09:35) | 62 | 99 % |
| Slices by Joseph nehme (on 31. July 2021, 12:43) | 47 | 96 % |
| Barnyard Mouse - purpl Collab by the_cogito (on 17. December 2021, 16:11) | 21 | 95 % |
| The Palindrome Loop by FlowJo (on 5. January 2022, 11:27) | 20 | 96 % |
| Parity Arrows by Jay Dyer (on 22. January 2022, 11:54) | 21 | 94 % |
| Hex 2: Regular Hexagons, Irregular Sudoku by mathpesto (on 8. June 2022, 22:53) | 23 | 94 % |
| Kropki-cycle by tesseralis (on 28. July 2022, 12:58) | 20 | 100 % |
| Several Little Boxes by jsmirob (on 17. November 2022, 04:39) | 36 | 94 % |
| Mountain sandwich sudoku by Nylimb (on 12. February 2023, 23:01) | 17 | 92 % |
| Black and White Cookie by pieguy (on 16. September 2023, 02:41) | 64 | 94 % |
| Thermal Arrows and Entropic Cages by MSDOS (on 30. May 2024, 07:23) | 66 | 95 % |
| TDF Stage 1 by palpot (on 29. June 2024, 09:00) | 44 | 92 % |
| Factor Map by ul-Rhymm (on 30. June 2024, 14:57) | 45 | 99 % |
| Antarctic Expedition (Icebarn Hybrid) by sfushidahardy (on 1. July 2024, 23:01) | 21 | 91 % |
| Yin-Yang Whisperominos by Die Hard (on 4. August 2024, 11:15) | 37 | 94 % |
| Shield Birds by 99%Sneaky (on 16. September 2024, 23:44) | 105 | 94 % |
| Slide & Seek #1: An X-wing on Diamonds by Pixel_StrengthReal (on 11. January 2025, 19:42) | 18 | 94 % |
| Self-Help Aisle (with ChinStrap) by mellowrobinson (on 27. June 2025, 15:00) | 44 | 91 % |
