(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 | |
|---|---|---|---|
 | Balanced Sudoku #02 by Nell Gwyn (on 24. September 2022, 04:50) | 12 |  100 % |
| Falling Arrows by antiknight (on 24. December 2022, 02:44) | 89 | 94 % |
| Known Unknowns by Scruffamudda (on 6. June 2023, 10:29) | 17 | 93 % |
| What are the odds? (Parity killer/little killer) by sujoyku (on 18. August 2023, 10:15) | 42 | 94 % |
| Checkered (Psycho Look-and-Say/German whispers/Renban) by dumediat (on 29. August 2023, 16:54) | 13 | 95 % |
| The Juggler [Modular Lines, Kropki Pairs] by Malrog (on 13. March 2024, 13:03) | 27 | 94 % |
| Three's a Crowd by XeonRisq (on 17. July 2024, 02:00) | 11 | 91 % |
| Gemstones by Scojo (on 17. July 2024, 21:29) | 17 | 91 % |
| Yakamoz by Niverio (on 22. December 2024, 11:28) | 27 | 99 % |
| Sixteen Candles by Farkov (on 9. March 2025, 03:02) | 13 | 93 % |
| Narrow Laneway Filled With Crooks by 99%Sneaky (on 30. August 2025, 00:53) | 28 | 95 % |
| Suspicious Bilateralisms by jennyaa (on 7. November 2025, 01:02) | 12 | 91 % |
| Spot the Difference by marty_sears (on 13. December 2023, 03:29) | 133 | 97 % |
| Chaotic Sums by kuraban (on 26. October 2022, 19:34) | 81 | 97 % |
| Roller Coaster Fillomino #2 (9x9) by Jesper (on 21. April 2021, 09:08) | 63 | 100 % |
| 10+ Line Sudoku by Phistomefel (on 1. September 2022, 10:03) | 187 | 98 % |
| Neue Post aus Rätselhausen by Statistica (on 1. December 2015, 00:12) | 49 | 95 % |
| Battle With The Archers 4: Dual Crossbows by Playmaker6174 (on 23. June 2021, 07:57) | 56 | 95 % |
| Chaos Construction: Akari by Niverio (on 25. June 2022, 21:28) | 51 | 98 % |
| Wormholes (Remix) by Nordy (on 14. May 2023, 08:00) | 54 | 97 % |
