(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 | |
|---|---|---|---|
 | Sackgassen by Myxo (on 15. August 2023, 05:27) | 36 |  96 % |
| Prismarine [Akari RGB] by wisty (on 16. October 2023, 09:10) | 19 | 97 % |
| ZZZ-iii-PPP (Deconstruction 11x11) by SparkNights (on 12. February 2024, 06:00) | 16 | 100 % |
| Smelly Peas by MathGuy_12 (on 13. November 2025, 01:43) | 19 | 93 % |
| Five Cage Jigsaw by RandyDan (on 29. January 2026, 18:55) | 20 | 90 % |
| Grouping All but One by Sneppix (on 8. February 2026, 14:31) | 44 | 93 % |
| Now the People Will Know We Were Here by ViKingPrime (on 17. April 2024, 16:15) | 49 | 98 % |
| Roman Whispers (XV German Whispers Sudoku) by Phistomefel (on 31. January 2022, 18:23) | 122 | 98 % |
| Fat X Little Killer Sudoku by Aspartagcus (on 31. August 2020, 10:20) | 33 | 95 % |
| Chaos Fillomino - Border Gaps #2 by Mark Sweep (on 21. December 2022, 10:00) | 34 | 99 % |
| overflow underway by aqjhs (on 9. January 2025, 05:05) | 29 | 91 % |
| zuul (w/ aqjhs) by ThePedallingPianist (on 31. October 2025, 10:31) | 39 | 94 % |
| Chaotic Choice by Manta-Ray (on 14. January 2026, 18:11) | 35 | 98 % |
| Antimatter by zetamath (on 14. January 2022, 01:53) | 43 | 94 % |
| Order Out Of Chaos by zzw (on 16. November 2023, 00:45) | 47 | 100 % |
| Smaller Territories by masetab (on 19. February 2026, 07:40) | 59 | 93 % |
| Wichtel 2017 (10): Luftige Flotte an Wolkenmousse in inversem Schneegestöber by wichtel (on 17. October 2018, 07:04) | 24 | 99 % |
| Exploded Compass Sudoku by stephane.bura (on 7. January 2021, 20:00) | 39 | 100 % |
| A Bridge Before the Rainbow by fritzdis (on 20. March 2021, 21:35) | 13 | 93 % |
| Thermo Battle by 10feet (on 18. February 2022, 17:00) | 26 | 98 % |
