(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 | |
|---|---|---|---|
 | Wichtel 2014 (9): Weihnachtsbaum by wichtel (on 19. March 2015, 01:24) | 38 |  99 % |
| Compass Fillomino #3: Large grid by MagnusJosefsson (on 23. April 2021, 17:44) | 42 | 100 % |
| Fairy Rings by Jay Dyer (on 1. January 2022, 20:17) | 41 | 98 % |
| Antimatter by zetamath (on 14. January 2022, 01:53) | 34 | 93 % |
| Menagerie by SSG (on 13. December 2022, 07:14) | 18 | 94 % |
| Missing Digits by FryTheGuy (on 15. January 2023, 21:01) | 18 | 95 % |
| So Very Wrogn by tallcat (on 20. June 2023, 08:00) | 56 | 91 % |
| Unlucky Sevens by noswald (on 7. June 2023, 04:52) | 40 | 93 % |
| Kakuro S-Cells Loop Knapp Daneben Jigsaw [Secret Satan #2] by Christounet (on 30. January 2024, 18:55) | 15 | 98 % |
| I.M.A.P.P: Wild Japanese Sum Tapa (12x12) by Playmaker6174 (on 29. January 2024, 22:31) | 16 | 97 % |
| Yin Yang Yin by Xenonetix (on 22. January 2023, 22:22) | 33 | 91 % |
| Japanese Sums Narrow Cave Cipher: Mirrors (11x11) by Jesper (on 2. June 2023, 16:04) | 28 | 100 % |
| Reef by zetamath (on 26. June 2023, 03:35) | 108 | 97 % |
| Knights Mate by blackjackfitz (on 17. January 2024, 20:52) | 35 | 94 % |
| Shady Fillomino by Agent (on 18. June 2024, 09:00) | 35 | 100 % |
| Heatstroke (Classic Thermo) by emmettcito (on 11. April 2021, 12:27) | 43 | 99 % |
| Unique by TotallyNormalCat (on 5. February 2021, 01:30) | 44 | 98 % |
| Carousel by twototenth (on 10. August 2021, 08:00) | 23 | 99 % |
| Rubber Bullets (10x10 Chaos Construction) by the_cogito (on 27. September 2022, 15:39) | 37 | 99 % |
| I Refuse to Give Sums! by LittleNightmaresLady (on 26. April 2023, 18:07) | 24 | 98 % |
