(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 | |
|---|---|---|---|
 | Palindrome Arrow Sudoku by EliasKar (on 11. September 2021, 03:08) | 24 |  92 % |
| Chaos Construction: Stitches by XeonRisq (on 18. February 2022, 01:00) | 22 | 98 % |
| Double-Crosser Deconstruction by Christounet (on 12. July 2024, 00:00) | 23 | 100 % |
| Elemental Avalanches (Cipher X-Sum Deconstruction) by Las4one (on 1. March 2025, 08:19) | 25 | 100 % |
| Zodiac Project: Leo by ChinStrap (on 16. July 2025, 13:54) | 46 | 95 % |
| Chaos Deconstruction: Japanese Sum by Phistomefel (on 13. February 2023, 20:00) | 115 | 98 % |
| Rainy Night by FryTheGuy (on 6. December 2021, 17:17) | 26 | 99 % |
| Deranked (Full Rank Deconstruction) by the_cogito (on 26. June 2023, 17:38) | 48 | 100 % |
| Working Nine To Five by fjam (on 8. January 2024, 20:03) | 23 | 96 % |
| Mosh Pit by IcyFruit (on 25. April 2024, 14:56) | 24 | 93 % |
| Orchard Out Of Chaos (with 3good5you) by SamuPiano (on 26. October 2024, 15:44) | 23 | 100 % |
| ...the rest is for you to discover by aqjhs (on 18. July 2025, 08:39) | 24 | 99 % |
| The Wheel by Mad-Tyas (on 10. December 2024, 17:40) | 21 | 93 % |
| Full Rank Ranked Cages by Justalilguy (on 4. September 2025, 05:06) | 22 | 90 % |
| Circled Killers by SparkNights (on 12. December 2023, 15:11) | 47 | 96 % |
| The Victoria Sandwich Is A Lie by fjam (on 8. June 2022, 17:50) | 20 | 97 % |
| Japanese Sums #1: Killer Cages by lerroyy (on 15. February 2023, 19:52) | 21 | 96 % |
| SubwaYY to H... ? [Secret Satan #2] by Christounet (on 4. January 2025, 16:24) | 19 | 100 % |
| Cyclone (Secret Satan 4-in-1 Sudoku/Shading/Loop Hybrid) by MaizeGator (on 5. January 2025, 03:30) | 22 | 97 % |
| Doubler Twin Deconstruction by Christounet (on 29. January 2025, 18:19) | 37 | 99 % |
