(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 | |
|---|---|---|---|
 | Archer's Prologue: Positive Mindset by Playmaker6174 (on 13. November 2021, 06:05) | 59 |  98 % |
| Nineteen? (X-sums Chaos Construction 2) by Lizzy01 (on 13. April 2022, 21:17) | 49 | 99 % |
| Yin-Yang Fillomino by Phistomefel (on 7. January 2021, 01:21) | 75 | 98 % |
| Sudoku Variants Series (305) - Encaged Kropki Sudoku by Richard (on 27. January 2021, 00:00) | 73 | 97 % |
| Chocolate Teapot by Qodec (on 5. May 2021, 16:01) | 74 | 97 % |
| ZAUBERN - MAGIE - Buchstabenrätsel by DocLogic (on 13. February 2020, 22:25) | 38 | 91 % |
| Sudoku Variants Series (292) - Coordinates Sudoku by Richard (on 28. October 2020, 00:00) | 63 | 96 % |
| The c(l)over-up by Sktx (on 6. July 2021, 12:29) | 25 | 91 % |
| Color Palette by Joseph nehme (on 18. December 2022, 10:14) | 129 | 97 % |
| Doublophobia by lepton (on 7. January 2023, 08:38) | 21 | 97 % |
| Sick and Twisted Sandwiches by Andrewsarchus (on 10. January 2023, 04:15) | 17 | 98 % |
| Double Arrow Sudoku by tesseralis (on 30. June 2023, 03:44) | 24 | 90 % |
| Dissident Factions by meggen033 (on 28. January 2024, 06:14) | 33 | 91 % |
| Slitherlink Region Sum Hexuro by Nell Gwyn (on 22. July 2024, 07:10) | 21 | 98 % |
| Out of the Loop by oskode (on 15. May 2025, 10:20) | 26 | 97 % |
| Moo's Final Boss by Laake (on 19. April 2025, 09:26) | 38 | 94 % |
| Cavernous Japanese Sum: Deconstruction (9x9) by Playmaker6174 (on 21. November 2025, 15:00) | 17 | 100 % |
| Chaotic Party Pack by Kafkapharnaum (on 2. January 2026, 05:18) | 21 | 100 % |
| Torn Apart by Black_Doom (on 18. August 2024, 11:58) | 67 | 96 % |
| Asterisk (palindrome killer sudoku x) by clover (on 23. November 2020, 16:01) | 88 | 94 % |
