(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 | |
|---|---|---|---|
 | ON EDGE: Brown & Green by marty_sears (on 9. February 2025, 11:08) | 196 |  97 % |
| Fishing Pentominoes by Agent (on 12. September 2025, 09:00) | 50 | 100 % |
| The Knot by tenaliraman (on 9. April 2021, 00:46) | 43 | 94 % |
| Disjoint 258 Sudoku by Qodec (on 8. October 2021, 18:05) | 63 | 94 % |
| Twenty-four and what? by andreasv (on 8. March 2022, 07:37) | 25 | 92 % |
| L.O.V.E. to S.O.L.V.E. by mathpesto (on 2. May 2022, 10:22) | 45 | 94 % |
| Skyline by FinnishGuy (on 6. May 2022, 22:24) | 19 | 92 % |
| Was it a car or a cat I saw? by Angelo (on 20. July 2022, 21:23) | 20 | 98 % |
| Canvas by Crusader175 (on 18. September 2022, 16:00) | 19 | 97 % |
| Three is a Crowd Sudoku #2 by Genomico (on 27. September 2022, 20:55) | 19 | 100 % |
| Anti-Z by Christounet (on 19. April 2023, 00:18) | 39 | 97 % |
| Hallways & Corridors (Between Numbered Rooms) by tallcat (on 16. September 2024, 21:27) | 88 | 92 % |
| Merry-Go-Round by Xenonetix (on 18. December 2025, 17:17) | 23 | 91 % |
 | Pernicious by NicoD (on 18. May 2026, 17:58) | 63 | 97 % |
| Samurai Sandwiches by mathpesto (on 28. December 2022, 17:34) | 67 | 94 % |
| Wichtel 2017 (5): Japanische Weihnachtskoralle 2358 by wichtel (on 31. May 2018, 09:05) | 48 | 96 % |
| Four Leaf... by Bremster (on 3. January 2022, 23:13) | 53 | 94 % |
| Quintessence [Pentominous Fillomino] by MicroStudy (on 29. June 2023, 21:28) | 80 | 95 % |
| Battlefield Sudoku #4: Knights! by Big Tiger (on 23. June 2020, 04:08) | 29 | 97 % |
| Sad Kropki by Zilou (on 12. September 2022, 01:08) | 34 | 90 % |
