(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 | |
|---|---|---|---|
 | Killer Sandwich by Phistomefel (on 6. February 2020, 22:14) | 100 |  96 % |
| Sudokabe [Nurikabe Deconstruction] by Christounet (on 20. March 2024, 12:08) | 46 | 99 % |
| Picking Blackcurrants by Kaktuslav (on 27. September 2025, 08:00) | 52 | 99 % |
| Normal Lunchboxes 2 by Undar_Beyond (on 25. May 2020, 16:14) | 44 | 92 % |
| Circle of Fifths by Cephalo (on 28. April 2022, 19:40) | 43 | 95 % |
| Amicus by Andrewsarchus (on 21. August 2023, 08:43) | 44 | 95 % |
| Ambiguous Entropy by XeonRisq (on 28. December 2022, 23:00) | 170 | 97 % |
| Parity Party XX, "Crescendo" by glum_hippo (on 19. June 2021, 01:06) | 35 | 97 % |
| Four Unique Ways by kolot (on 30. April 2022, 16:38) | 40 | 91 % |
| Delray Beach Sunrise (Yin-YANG Fillomino) by MaizeGator (on 6. August 2024, 04:04) | 81 | 98 % |
| Uncaged Cells by Md88keys (on 15. July 2025, 20:09) | 38 | 93 % |
| Marmoset by jwsinclair (on 2. July 2024, 16:05) | 40 | 96 % |
| Little Killer Sudoku #4 by Phistomefel (on 26. October 2020, 02:22) | 34 | 91 % |
| Chocona Road by mathpesto (on 15. May 2024, 04:57) | 34 | 95 % |
| Pentominous Cave by Tacosian (on 8. November 2024, 06:59) | 29 | 95 % |
| Scattered Odd Killer by MavericksJD (on 10. May 2021, 13:23) | 28 | 98 % |
| Draft Picks by ViKingPrime (on 11. September 2024, 16:30) | 24 | 97 % |
| The Equalizer by Playmaker6174 (on 11. September 2024, 10:00) | 25 | 94 % |
| Windmill by lerroyy (on 13. March 2022, 20:11) | 79 | 99 % |
| Laser (1) by Uhu (on 26. October 2020, 10:30) | 21 | 97 % |
