(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 | |
|---|---|---|---|
 | WYSI by brandon_bot (on 18. June 2021, 07:27) | 28 |  94 % |
| Instructionless by Jesper (on 8. December 2021, 09:27) | 66 | 97 % |
| Sandbox Mode [Irregular RSL Sudoku] by wisty (on 24. May 2022, 17:36) | 23 | 91 % |
| Zahlen nach Malen / Numbers by paint by olima (on 10. June 2022, 16:16) | 22 | 93 % |
| Go Kart Race by zegres (on 12. September 2023, 08:19) | 47 | 91 % |
| Croque Madame by Black_Doom (on 14. April 2024, 17:07) | 26 | 96 % |
| Thermal Counting Quads by MSDOS (on 28. June 2024, 02:51) | 33 | 94 % |
| Seven cats by psninn (on 30. January 2025, 07:50) | 27 | 90 % |
| Tri-Colour Coaster #1 by ClashCode (on 11. June 2025, 04:55) | 21 | 91 % |
| Blue Sticks by antiknight (on 26. July 2025, 01:49) | 23 | 91 % |
| Good and Plenty by Blobz (on 22. October 2025, 16:00) | 172 | 97 % |
| Sudoku Variants Series (275) - Confetti Sums Sudoku by Richard (on 1. July 2020, 00:00) | 108 | 98 % |
| XY-Differences Fillomino by glum_hippo (on 21. August 2023, 01:39) | 58 | 97 % |
| Moooooo by ademjaz (on 20. May 2024, 18:10) | 115 | 97 % |
| Lion-Fish (Killer Sudoku) by abed hawila (on 6. March 2021, 18:51) | 92 | 96 % |
| That's Sum Slithering by andreasv (on 16. April 2022, 08:56) | 38 | 97 % |
| Trust Me, I'm Lying by Chefofdeath (on 23. June 2022, 02:39) | 35 | 93 % |
| Hedge Maze by dennischen (on 20. May 2024, 10:10) | 32 | 91 % |
| Adventskalender 2025, Türchen 14 - Adventskerzen by Zzzyxas (on 14. December 2025, 07:00) | 36 | 97 % |
| Japanische Krypto-Summen-Trilogie (3) by ibag (on 31. December 2013, 07:00) | 70 | 99 % |
