(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 | |
|---|---|---|---|
 | Snake Egg Sudoku by Phistomefel (on 31. May 2020, 00:19) | 103 |  98 % |
| Dustpan (Disjoint parity sweeper sudoku) by Qodec (on 23. February 2023, 13:00) | 122 | 97 % |
| A puzzle for SXH by psninn (on 21. December 2024, 04:02) | 60 | 96 % |
| Butterfly Effect (Renban Between Lines Sudoku) by Phistomefel (on 6. February 2023, 22:33) | 159 | 98 % |
| Battle With The Archers 38: The War of Three Worlds by Playmaker6174 (on 10. April 2023, 05:37) | 51 | 96 % |
| In a Kropki Far, Far Away by yttrio (on 12. October 2024, 01:57) | 49 | 95 % |
| Squishdoku by Jay Dyer (on 21. November 2023, 00:36) | 95 | 95 % |
| Entwined Sandwiches Sudoku by matt383 (on 7. April 2020, 17:25) | 43 | 97 % |
| X-Box 180 by zegres (on 24. January 2022, 05:43) | 42 | 96 % |
| Schrödinger's Leopard by tesseralis (on 12. July 2022, 11:52) | 41 | 99 % |
| Undeca Error (Killer, Anti-Knight) by Chilly (on 5. September 2022, 19:28) | 91 | 96 % |
| Japanische Summen mit Hochhaushinweisen by Zzzyxas (on 6. September 2024, 00:00) | 37 | 100 % |
| Numbered Rooms of Entropy by Mad-Tyas (on 6. January 2025, 05:15) | 43 | 91 % |
| Think you can break in? (FOW) by antiknight (on 17. August 2024, 02:06) | 188 | 92 % |
| Chaotic X-Sums by Florian Wortmann (on 6. September 2023, 18:09) | 118 | 97 % |
| ZIRKUS - buntes Buchstabenrätsel / colorful letter puzzle by DocLogic (on 30. April 2020, 22:59) | 32 | 98 % |
| Rivers and Islands Sudoku by matt383 (on 3. May 2020, 02:47) | 80 | 97 % |
| Little Killer Sudoku by Philipp Huber (on 5. July 2020, 13:02) | 35 | 91 % |
| Digital Sandwich by Prof.Dori (on 30. May 2023, 21:35) | 32 | 95 % |
| Ripples by riffclown (on 4. August 2023, 21:59) | 74 | 96 % |
