(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 | |
|---|---|---|---|
 | FABRIK - Buchstabenrätsel / Letter puzzle by DocLogic (on 29. September 2021, 18:05) | 35 |  97 % |
| Intertwined by siron2133 (on 29. October 2022, 11:34) | 37 | 91 % |
| Neon Neko by Senip (on 16. July 2023, 17:58) | 40 | 93 % |
| Adventskalender 2025, Türchen 7 - Adventskerzen by Zzzyxas (on 7. December 2025, 07:00) | 42 | 96 % |
| Frohe Weihnachten! by Richard (on 23. December 2011, 12:00) | 59 | 95 % |
| U-Bahn unter Hochhäusern (Teil 7) by Zzzyxas (on 5. May 2012, 18:21) | 54 | 99 % |
| Chaos Control by Scojo (on 15. April 2023, 01:59) | 60 | 94 % |
| Anticlockwise by juggler (on 22. December 2024, 22:58) | 63 | 97 % |
| Odd / Even Killer Sudoku (#1) by Mr.Menace (on 30. October 2020, 21:11) | 26 | 91 % |
| Little Killer by abed hawila (on 18. January 2021, 12:55) | 22 | 94 % |
| Sandwich Thermo Arrow Sudoku by Lizzy01 (on 9. May 2021, 20:17) | 25 | 90 % |
| Tic Tac Logic Sudoku by panthchesh (on 12. December 2021, 14:10) | 26 | 94 % |
| Arrows And Renban Lines by Jeet Sampat (on 11. November 2022, 00:32) | 47 | 97 % |
| Reversing Valve (Dynamic Fog Edition) by ViKingPrime (on 4. June 2025, 15:56) | 53 | 93 % |
| Floodwaters by Jay Dyer (on 9. July 2022, 00:45) | 73 | 97 % |
| Unstable Seesaws (Collab with Piatato) by Cane_Puzzles (on 5. August 2025, 16:04) | 85 | 98 % |
| Japanische Summen-Höhle 2358 by Uhu (on 1. August 2017, 22:32) | 48 | 98 % |
| Thermo Dot by FullDeck-Missing (on 4. April 2023, 23:54) | 97 | 91 % |
| Coloring Book #9: The Corridor by blackjackfitz (on 23. October 2024, 17:05) | 135 | 97 % |
| Mysterious Mirrors by marty_sears (on 25. October 2025, 23:49) | 129 | 94 % |
