(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 | |
|---|---|---|---|
 | Stealth (feat. tallcat) by the_cogito (on 11. November 2022, 04:10) | 87 |  95 % |
| Ping Pong by antiknight (on 19. January 2025, 19:37) | 102 | 95 % |
| Sandwich Sudoku--Odd or Even(CSC2020 Leftover) by cdwg2000 (on 21. October 2020, 16:06) | 17 | 96 % |
| Sudoku-GP Leftover (1): Liar-X-Sums by JonaS2010 (on 27. October 2020, 17:43) | 39 | 98 % |
| N-Sums Sudoku by ICHTUES (on 28. February 2021, 06:00) | 14 | 90 % |
| Taco Bowl 2 - More Meat by DiMono (on 14. March 2021, 19:30) | 32 | 98 % |
| Handshake by Asimir (on 13. May 2021, 03:10) | 19 | 94 % |
| Counterrotation by Jay Dyer (on 14. November 2021, 02:42) | 16 | 94 % |
| A riddle, wrapped in an entropic line, inside a sudoku by Raumplaner (on 24. April 2022, 15:17) | 14 | 93 % |
| What Do Little Killers Eat? by RockyRoer (on 14. October 2022, 03:47) | 68 | 96 % |
| Sashigane Sudoku by Ambrose (on 14. November 2022, 14:06) | 79 | 97 % |
| $1.59 Tacos by Andrewsarchus (on 12. January 2023, 01:18) | 16 | 90 % |
| ZandwYch by ICHTUES (on 10. September 2023, 06:00) | 32 | 97 % |
| MILCHPRODUKT - Buchstabenrätsel / Letter Puzzle by DocLogic (on 6. October 2023, 13:56) | 31 | 97 % |
| Negative Energy by jojo81gaming (on 26. January 2024, 01:28) | 14 | 98 % |
| Quantum Superposition (Molecules, Whispers, Renban) by Crusader175 (on 22. July 2024, 16:00) | 19 | 92 % |
| Advent Calendar by Bearded Fool (on 1. December 2024, 12:00) | 96 | 97 % |
| Between a Relative and a Stranger by Elytron (on 30. September 2024, 00:47) | 17 | 98 % |
| fractionated recollection by aqjhs (on 20. March 2025, 07:05) | 15 | 93 % |
| Trichroma Paintomino #5 by MaizeGator (on 31. March 2026, 22:18) | 18 | 98 % |
