(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 | |
|---|---|---|---|
 | Colour Quest by Fenners (on 12. January 2025, 21:02) | 140 |  95 % |
| Gegentakt by Myxo (on 27. July 2024, 11:33) | 109 | 97 % |
| Extra Tall Skyscrapers by yttrio (on 4. August 2023, 20:04) | 51 | 96 % |
| Froschteich by Myxo (on 25. August 2024, 15:01) | 52 | 94 % |
| Twin Killer Sudoku V by Richard (on 16. March 2012, 12:00) | 74 | 93 % |
| Spin City by Bremster (on 26. November 2022, 04:47) | 92 | 94 % |
| Anti-8 Killer by Blashyrkh (on 25. September 2023, 20:51) | 87 | 94 % |
| Pea-thagorean Theorem (with sujoyku) by ChinStrap (on 6. January 2025, 03:46) | 97 | 94 % |
| Roller Coaster mit Extras 6 by Uhu (on 11. April 2018, 22:43) | 63 | 99 % |
| Für Luca zum Geburtstag: Krypto-Inselrundweg by CHalb (on 4. November 2019, 09:29) | 30 | 95 % |
| 6x6 Hypercube by DiMono (on 18. February 2022, 23:40) | 28 | 95 % |
| [Fog of War Series] 3-2: Sequel to Portals by AstralSky (on 24. April 2023, 22:36) | 43 | 91 % |
| A Deal With the Devil by ViKingPrime (on 14. December 2023, 16:30) | 29 | 98 % |
| Royal Ring Road by SingingFish (on 26. February 2026, 01:38) | 34 | 99 % |
| Sudoku Variants Series (369) - Killer - Hidden Arrows Sudoku by Richard (on 4. May 2022, 01:00) | 82 | 97 % |
| Summenbild-Rundwegrätsel (1) by Uhu (on 3. November 2020, 20:29) | 44 | 98 % |
| Odd Cages by Phantou (on 18. July 2023, 22:40) | 46 | 93 % |
| Half and Half by Black_Doom (on 2. March 2025, 10:12) | 43 | 94 % |
| Bahamas by Qodec (on 24. April 2021, 20:43) | 117 | 97 % |
| Killer Sudoku: The Fearsome Twelves by Playmaker6174 (on 1. December 2022, 19:43) | 68 | 97 % |
