(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 | |
|---|---|---|---|
 | Small to big by lerroyy (on 15. January 2022, 19:26) | 13 |  93 % |
| Rex Parvae by JayForty (on 27. May 2022, 17:48) | 72 | 99 % |
| Earthworm City (Killer + Renban Sudoku) by Sktx (on 17. August 2022, 10:57) | 12 | 98 % |
| Yin Yang Vaults by Schwupel (on 1. September 2022, 22:19) | 49 | 97 % |
| Three in the spotlight by Fool on Hill (on 11. September 2022, 15:21) | 26 | 94 % |
| Equivocation by SSG (on 27. September 2022, 07:02) | 35 | 97 % |
| Fillomino Pyramid by Myxo (on 26. February 2023, 16:04) | 38 | 97 % |
| Who’s the man in the mirror ? [9×9 mirrored digits] by Christounet (on 11. September 2023, 18:21) | 73 | 97 % |
| Double Ender by dodomos (on 15. September 2023, 10:00) | 15 | 90 % |
| Baby Steps by antiknight (on 7. November 2023, 23:38) | 69 | 95 % |
| A Duel at Christmas by The Book Wyrm (on 13. January 2024, 13:10) | 11 | 100 % |
| Skyline by XeonRisq (on 1. June 2024, 22:00) | 11 | 98 % |
| Slow Snake Somedoku by blackjackfitz (on 11. July 2024, 05:25) | 41 | 97 % |
| Intuition by psninn (on 1. November 2024, 14:43) | 13 | 90 % |
| Numb Numerals by kieserel (on 22. November 2024, 08:42) | 12 | 95 % |
| Yin Yang Doubler Uniqueness by Oddlyeven (on 3. April 2026, 19:22) | 84 | 97 % |
| Wall Sudoku by Phistomefel (on 22. December 2021, 23:59) | 108 | 99 % |
| Hijinks by marty_sears (on 20. April 2026, 01:00) | 137 | 97 % |
| One with the Circus by JeffWajes (on 8. January 2026, 09:36) | 103 | 96 % |
| Chaos Construction: 2nd Region X-Sums #2 (9x9) by Jesper (on 5. April 2022, 11:15) | 71 | 100 % |
