(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 | |
|---|---|---|---|
 | Eternal Entropy by Mad-Tyas (on 28. September 2022, 12:15) | 32 |  94 % |
| Secret Kingdoms by SenatorGronk (on 27. March 2024, 17:36) | 27 | 98 % |
| Geschenk für pin7guin: Kropki-U-Bahn unter Kropki-Hochhäusern by Zzzyxas (on 6. September 2013, 00:00) | 46 | 98 % |
| Welcome, 2025! by Gliperal (on 1. January 2025, 14:45) | 51 | 93 % |
| Palindrome Arrow Sudoku by EliasKar (on 11. September 2021, 03:08) | 23 | 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 % |
| Japanese Icewalk (2) by KNT (on 21. August 2025, 00:48) | 24 | 90 % |
| 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 % |
| Elemental Avalanches (Cipher X-Sum Deconstruction) by Las4one (on 1. March 2025, 08:19) | 25 | 100 % |
| Deranked (Full Rank Deconstruction) by the_cogito (on 26. June 2023, 17:38) | 47 | 100 % |
| Archer's Entropy 3: Peace by Mad-Tyas (on 14. September 2022, 17:22) | 22 | 93 % |
| Working Nine To Five by fjam (on 8. January 2024, 20:03) | 22 | 96 % |
| Mosh Pit by IcyFruit (on 25. April 2024, 14:56) | 22 | 93 % |
| Orchard Out Of Chaos (with 3good5you) by SamuPiano (on 26. October 2024, 15:44) | 22 | 100 % |
| The Wheel by Mad-Tyas (on 10. December 2024, 17:40) | 21 | 93 % |
| Circled Killers by SparkNights (on 12. December 2023, 15:11) | 47 | 96 % |
| Japanese Sums #1: Killer Cages by lerroyy (on 15. February 2023, 19:52) | 20 | 96 % |
| SubwaYY to H... ? [Secret Satan #2] by Christounet (on 4. January 2025, 16:24) | 19 | 100 % |
