(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 | |
|---|---|---|---|
 | Deconstruction Chaos Suguru #1,729: It’s All a Lie! by mathpesto (on 2. April 2022, 20:58) | 111 |  99 % |
| C.C. Geass by lerroyy (on 8. August 2022, 04:00) | 44 | 99 % |
| Fillmat-doku by yttrio (on 12. January 2024, 21:48) | 38 | 98 % |
| Wichtel 2019 (11 und Schluss): Es soll nicht langweilig werden! by wichtel (on 6. November 2020, 20:01) | 17 | 100 % |
| Chalice (Anti-knight, Thermo) by emmettcito (on 23. April 2021, 19:21) | 46 | 92 % |
| CTC Tribute Arrow Sudoku by Lizzy01 (on 6. June 2021, 20:37) | 25 | 94 % |
| Anti-King Killer by Jeet Sampat (on 18. November 2021, 05:00) | 18 | 92 % |
| Recycler by Jay Dyer (on 24. March 2022, 19:39) | 21 | 98 % |
| Sandwich Box by ademjaz (on 7. February 2023, 20:29) | 19 | 97 % |
| The Chained Trio (Between x Lockout x Double Arrow) by Playmaker6174 (on 19. March 2023, 18:23) | 24 | 96 % |
| Yin-Yang Renbanominos 1 by Die Hard (on 29. April 2024, 07:56) | 23 | 93 % |
| Thermo Space Force by PotatoHead21 (on 31. May 2021, 03:51) | 41 | 95 % |
| Ocean by kolot (on 15. August 2021, 07:58) | 39 | 98 % |
| Chaos Construction: Numbered Regions #1 by Jesper (on 24. September 2022, 15:15) | 150 | 100 % |
| Magnetplatten-Tausch-ABCtje (2) by ibag (on 27. March 2013, 00:00) | 31 | 98 % |
| Wichtel 2017 (12 und Schluss): Geteilte U-Bahn by wichtel (on 24. December 2018, 10:04) | 33 | 99 % |
| Little Kropkiller by Mark Sweep (on 13. November 2020, 10:00) | 37 | 95 % |
| California skyscraper sudoku by Shinya (on 12. May 2021, 09:02) | 16 | 93 % |
| Castle Wall / Yin-Yang #2 (13X13) by MagnusJosefsson (on 27. December 2022, 13:28) | 48 | 99 % |
| Unendliches Höhlenrätsel (Infinity Cave) by Phistomefel (on 3. April 2023, 20:00) | 23 | 92 % |
