(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 | |
|---|---|---|---|
 | Triple Decker by Mimaamakim (on 29. August 2021, 20:28) | 35 |  98 % |
| Houston by ICHTUES (on 5. September 2021, 06:00) | 26 | 92 % |
| Equal Sudoku by kolot (on 25. October 2021, 07:39) | 26 | 99 % |
| Anti-Knight, Arrows, and Renban by Jeet Sampat (on 26. October 2021, 23:26) | 39 | 94 % |
| Secrets and Lines by starwarigami (on 2. November 2021, 19:23) | 77 | 96 % |
| Killer Ambiguity by abed hawila (on 8. February 2022, 00:34) | 45 | 97 % |
| Repeater by mathpesto (on 19. March 2022, 04:47) | 54 | 99 % |
| Progressive Divisors by DiMono (on 3. April 2022, 21:10) | 49 | 96 % |
| Ghost by Jay Dyer (on 13. April 2022, 15:50) | 27 | 97 % |
| Imaginary Cages by brandon_bot (on 1. May 2022, 21:14) | 31 | 98 % |
| Killer - Region Sum Lines - Cave by abed hawila (on 9. May 2022, 20:41) | 70 | 100 % |
| Build Your Own Killer: High Pressure by Playmaker6174 (on 14. September 2022, 22:27) | 44 | 100 % |
| The Devil's Cage by TinkerTroy (on 3. October 2022, 18:36) | 40 | 96 % |
| Cursed Quiver (Arrow Deconstruction) by Xendari (on 6. October 2022, 09:10) | 50 | 99 % |
| Swanky Sandwiches [S-Cell Variant Sudoku] by wisty (on 13. October 2022, 23:07) | 15 | 100 % |
| Squbler's 100 by mormagli (on 18. October 2022, 02:39) | 38 | 95 % |
| Points 'round by damasosos92 (on 18. April 2023, 20:01) | 17 | 91 % |
| Anti Minesweeper Chaos by Polycarp (on 29. April 2023, 20:24) | 33 | 93 % |
| Above Thy Neighbour by marty_sears (on 20. June 2023, 19:20) | 58 | 91 % |
| Wichtel 2022 (1): Die Neue Karte von Krakatau by wichtel (on 22. June 2023, 08:08) | 16 | 96 % |
