(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 | |
|---|---|---|---|
 | Summenbild-Rundwegrätsel (1) by Uhu (on 3. November 2020, 20:29) | 44 |  98 % |
| Unique Killers by Yawnus (on 24. February 2023, 11:50) | 52 | 96 % |
| Odd Cages by Phantou (on 18. July 2023, 22:40) | 46 | 93 % |
| Anti-Knight Thermos 3 by Jeet Sampat (on 7. October 2025, 05:57) | 100 | 98 % |
| Gegentakt by Myxo (on 27. July 2024, 11:33) | 107 | 97 % |
| Killer Sudoku: The Fearsome Twelves by Playmaker6174 (on 1. December 2022, 19:43) | 68 | 97 % |
| Unstable Seesaws (Collab with Piatato) by Cane_Puzzles (on 5. August 2025, 16:04) | 81 | 97 % |
| Coloring Book #9: The Corridor by blackjackfitz (on 23. October 2024, 17:05) | 132 | 97 % |
| Wichtel 2017 (9): 26341413052226052223243316041107251607 by wichtel (on 3. October 2018, 05:06) | 26 | 96 % |
| Snake Egg Sum Sudoku by Quarterthru (on 20. July 2020, 20:00) | 16 | 94 % |
| Juggling with the Twins (Partial Killer) by SudokuExplorer (on 2. October 2020, 02:00) | 33 | 91 % |
| Octothorpe by Konzert (on 27. February 2021, 20:23) | 20 | 91 % |
| Cracked by abed hawila (on 20. April 2021, 01:54) | 12 | 100 % |
| Do Have A Go! by virtual (on 19. May 2021, 06:45) | 13 | 91 % |
| Kaged Knights by kuraban (on 27. June 2021, 02:50) | 35 | 98 % |
| Arrows of Central Tendency by mathpesto (on 14. November 2021, 21:48) | 16 | 91 % |
| Unique Arrow Sudoku by tsergiiv (on 19. March 2022, 08:07) | 15 | 93 % |
| Tutotu by Fafrd (on 10. June 2022, 02:35) | 25 | 97 % |
| BTNCA by ICHTUES (on 3. July 2022, 06:00) | 46 | 96 % |
| Position Sums: Fillomino (11x11) by ONeill (on 20. October 2022, 05:59) | 42 | 100 % |
