(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 | |
|---|---|---|---|
 | Which is Which, Again? by DJV (on 22. February 2023, 05:02) | 47 |  95 % |
| Treasure Torus by RaygunUltra (on 19. May 2024, 05:16) | 12 | 93 % |
| Mobius Trip by DubiousMobius (on 8. September 2024, 17:38) | 17 | 91 % |
| Recoil: A Proper Introduction by damasosos92 (on 17. March 2025, 18:09) | 38 | 95 % |
| Renban Fillomino by MagnusJosefsson (on 26. March 2022, 14:01) | 86 | 98 % |
| Symmetry? by Qodec (on 13. April 2021, 20:16) | 81 | 90 % |
| Battle With The Archers 41: The Fate of Three Worlds (refined) by Playmaker6174 (on 1. March 2026, 03:00) | 42 | 95 % |
| Antiknight-Killer Sudoku - Fortyfour by X13579 (on 16. June 2020, 10:28) | 64 | 93 % |
| Rainbow Bricks by tsc (on 2. September 2022, 23:14) | 80 | 95 % |
| Bridging The Mines by Florian Wortmann (on 7. December 2023, 20:20) | 207 | 96 % |
| Four Sevens by ThePedallingPianist (on 8. December 2022, 19:53) | 30 | 92 % |
| A Meandering Path by 10feet (on 6. July 2021, 06:11) | 36 | 94 % |
| Sharing is Caring (Twist on Renban Sudoku) by purpl (on 30. March 2022, 00:57) | 35 | 97 % |
| Solver, there's a fly on my Sudoku! by IcyFruit (on 25. November 2023, 22:39) | 115 | 96 % |
| Pünktchen Sudoku 3 by Richard (on 6. June 2009, 23:45) | 138 | 90 % |
| Sum Amount of Trouble by Tyrgannus (on 20. August 2023, 00:08) | 96 | 95 % |
| Anti-killer Sudoku by JoJoMcFroYo (on 26. June 2020, 14:55) | 25 | 90 % |
| Happy Holidays #3: Wassailing by Big Tiger (on 9. December 2020, 00:00) | 25 | 100 % |
| Lil' Kill by PrimeWeasel (on 11. March 2021, 07:29) | 38 | 90 % |
| Little Killer Thermo Palindrome Sudoku by Cane_Puzzles (on 19. March 2021, 16:16) | 48 | 94 % |
