(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 | |
|---|---|---|---|
 | Sandwich Sudoku - Find x!!!! Part 4 by ProwlingTiger (on 31. May 2020, 00:45) | 21 |  96 % |
| yin yang john (conway) by aqjhs (on 8. April 2025, 01:50) | 34 | 93 % |
| King by ICHTUES (on 22. August 2021, 06:00) | 61 | 95 % |
| Lost Town (Lost and Found #6) by .proxz14 (on 15. March 2025, 10:00) | 52 | 95 % |
| Hells Bells by Christounet (on 10. July 2023, 23:15) | 91 | 96 % |
| Just One Cells Sudoku(WS+PC2021 Leftover) by cdwg2000 (on 24. November 2021, 06:35) | 28 | 93 % |
| Warp Speed Factor 4 by The Bard (on 5. January 2026, 02:55) | 62 | 94 % |
| Glyphs #4 by damasosos92 (on 28. January 2023, 20:42) | 26 | 92 % |
| Killer Sudoku - The Cloverleaf by Phistomefel (on 6. September 2020, 13:21) | 100 | 94 % |
| Friends² by JoWovrin (on 1. November 2021, 19:16) | 69 | 100 % |
| Mind the Gap by juggler (on 6. July 2024, 06:05) | 68 | 97 % |
| Colours in the (k)night XVIII by Villse (on 24. November 2025, 11:02) | 96 | 92 % |
| Krypto Sandwich Sudoku by Realshaggy (on 30. December 2019, 15:22) | 46 | 91 % |
| Taurus (Arrow Killer) by tallcat (on 4. May 2021, 13:32) | 50 | 97 % |
| Bizarro Killer by Strosahl (on 12. June 2020, 05:38) | 27 | 97 % |
| Rotated Lines Sudoku by brandon_bot (on 8. December 2020, 04:12) | 17 | 94 % |
| From Nothing, Something by Gliperal (on 8. May 2022, 09:32) | 15 | 92 % |
| Get Up on the Hydra's Back! (Chaos Construction) by tesseralis (on 20. August 2022, 10:38) | 46 | 100 % |
| Signature Sudoku by Nell Gwyn (on 5. September 2022, 06:10) | 17 | 98 % |
| Between Friends by Die Hard (on 18. September 2023, 01:29) | 20 | 92 % |
