(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 | |
|---|---|---|---|
 | Japanese Ranking by KNT (on 11. June 2024, 21:18) | 65 |  99 % |
| Killer Sudoku(002) by cdwg2000 (on 26. August 2020, 08:14) | 30 | 95 % |
| Arrow Laboratory by PotatoHead21 (on 20. January 2023, 15:12) | 33 | 96 % |
| Antiknight Thermo Sudoku by PotatoHead21 (on 26. July 2023, 18:25) | 58 | 96 % |
| Crossing A38 by Agent (on 13. May 2025, 09:00) | 27 | 96 % |
| Heatstroke (Classic Thermo) by emmettcito (on 11. April 2021, 12:27) | 81 | 97 % |
| The Butterfly Effect by PrimeWeasel (on 5. February 2021, 21:08) | 22 | 97 % |
| Wichtel 2021 (7): In der Weihnachtsbäckerei by wichtel (on 4. October 2022, 21:02) | 19 | 100 % |
| My cup runneth over intensely by Fool on Hill (on 19. August 2022, 13:29) | 26 | 96 % |
| Invisible Cages by Ennead (on 5. March 2023, 15:14) | 23 | 97 % |
| Vivi Loca (Irregular Killer Sudoku) by Qodec (on 2. May 2023, 15:30) | 44 | 94 % |
| So Very Wrogn by tallcat (on 20. June 2023, 08:00) | 66 | 91 % |
| Colossal Masyu Masyu-Sudoku by Christounet (on 8. October 2023, 21:52) | 41 | 99 % |
| Ribbon World by Sniglett (on 3. December 2023, 03:31) | 41 | 95 % |
| Kakuro S-Cells Loop Knapp Daneben Jigsaw [Secret Satan #2] by Christounet (on 30. January 2024, 18:55) | 18 | 99 % |
| Captain Calamari (Somedoku, Octopus) by ThePedallingPianist (on 18. May 2024, 02:02) | 25 | 92 % |
| Shindig Redone 2 (Anti-Knight, Renban) by juddimal (on 18. April 2025, 07:09) | 46 | 95 % |
| TH13TEEN by IcyFruit (on 13. September 2025, 13:13) | 63 | 93 % |
| Onion by the_cogito (on 7. November 2023, 17:10) | 81 | 98 % |
| Pfeilchenbeet / Arrow Farm by Phistomefel (on 17. November 2020, 20:01) | 56 | 99 % |
