(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 | |
|---|---|---|---|
 | X---V*5 by NurglesGift (on 25. April 2025, 06:00) | 67 |  96 % |
| Thermal Signatures by Kafkapharnaum (on 12. May 2025, 01:13) | 62 | 98 % |
| Quaere (Kropki + Counting Quads) by tallcat (on 26. June 2024, 23:37) | 61 | 97 % |
| Anti-Knight Killer Sudoku - Balanced cages by ahaupt (on 31. May 2020, 22:31) | 44 | 90 % |
| Kakuro S-Cells Loop [Secret Satan #1] by Christounet (on 25. January 2024, 11:57) | 34 | 98 % |
| Chaos Construction: X-Sums (9x9) by Jesper (on 21. June 2021, 08:34) | 121 | 96 % |
| Colorguru Chaos Deconstruction: Palindromes by crispy16 (on 17. June 2022, 19:42) | 45 | 99 % |
| Tapa mit Steigerung by berni (on 5. February 2009, 15:07) | 182 | 95 % |
| Yin-yang Anti-Knight by Tom1i (on 30. April 2020, 21:59) | 16 | 96 % |
| Two stealth bombers crashing into each other, with tea sandwiches by clover (on 1. December 2020, 20:07) | 26 | 96 % |
| Roman Lockout by Jay Dyer (on 19. February 2022, 23:16) | 25 | 94 % |
| Sumsweeper by Xenonetix (on 9. May 2022, 01:33) | 56 | 96 % |
| Which Blare? by XeonRisq (on 28. August 2022, 22:00) | 18 | 93 % |
| Haisudoku Thermoline (Thermo Sudoku+Haisu hybrid) by AnalyticalNinja (on 15. November 2022, 03:02) | 35 | 100 % |
| Three-Line Riddle by JeremyDover (on 28. November 2022, 23:35) | 23 | 99 % |
| Centroid by DarthParadox (on 24. May 2024, 17:57) | 26 | 91 % |
| Underground Traffic (U-Bahn tetromino) by Samish (on 10. October 2024, 12:09) | 23 | 99 % |
| Threads by arbitrary (on 29. November 2024, 18:47) | 21 | 95 % |
| Echo Chamber by etoler (on 24. February 2025, 16:25) | 60 | 96 % |
| who wants seconds? by aqjhs (on 9. May 2025, 02:00) | 22 | 96 % |
