(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 | |
|---|---|---|---|
 | Treasure Map by FryTheGuy (on 7. September 2021, 05:36) | 39 |  97 % |
| Criss Cross by FullDeck-Missing (on 19. July 2022, 15:04) | 47 | 93 % |
| Low Tide by Schwupel (on 18. August 2023, 21:25) | 47 | 91 % |
| Eiskalte Magnetplatten by berni (on 16. December 2008, 22:28) | 107 | 95 % |
| Magic Clone Knight Sudoku by Rotstein (on 27. May 2020, 01:04) | 33 | 92 % |
| Irregular Sandbattle Sudoku (Starbattle vs. Sandwich) by Osh Tirola (on 14. June 2020, 15:00) | 31 | 97 % |
| Illusion by XeonRisq (on 29. May 2023, 00:00) | 27 | 91 % |
| Guidance by Jagga (on 1. July 2023, 20:07) | 28 | 92 % |
| Zodiac Project: Gemini by Christounet (on 19. September 2024, 13:18) | 80 | 97 % |
| Seattle by ICHTUES (on 7. November 2021, 06:00) | 67 | 98 % |
| Sharing Is Caring by ThePedallingPianist (on 5. January 2024, 02:59) | 109 | 96 % |
| Puzzle by usp (on 10. April 2015, 00:00) | 38 | 98 % |
| Nine Bent Arrows, One Straight by rmahus (on 14. March 2023, 10:00) | 43 | 97 % |
| Little Killer Killer Sudoku - Pinwheel by DiMono (on 27. October 2020, 23:51) | 53 | 94 % |
| A Very Odd Killer by Niverio (on 9. June 2021, 17:55) | 54 | 99 % |
| Renban Skyscrapers (CTC 400k subscribers) by Florian Wortmann (on 3. October 2021, 12:42) | 47 | 92 % |
| Shade Some More Sum Lines by Xendari (on 23. August 2023, 07:51) | 51 | 98 % |
| Lumos Maxima by chameleon (on 5. October 2022, 16:10) | 516 | 95 % |
| Worm on a Stick by ThePedallingPianist (on 20. December 2022, 01:17) | 71 | 92 % |
| Sudoku Variants Series (319) - Star Battle Sandwich by Richard (on 5. May 2021, 00:00) | 74 | 95 % |
