(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 | |
|---|---|---|---|
 | World's Tallest Sandwich by Jreg (on 21. August 2024, 13:01) | 16 |  92 % |
| Mambo by zetamath (on 6. September 2024, 00:16) | 28 | 96 % |
| Crypto Japanese Cave (1) by KNT (on 11. October 2022, 08:04) | 80 | 98 % |
| The Graveyard Of Schrödinger by fjam (on 25. September 2023, 18:11) | 77 | 97 % |
| Japanische Inseln, Teil 2 by pirx (on 25. February 2014, 18:30) | 55 | 98 % |
| Japanische Koralle Krypto by Uhu (on 22. January 2017, 16:24) | 46 | 99 % |
| Kurodoku by yttrio (on 27. July 2024, 02:27) | 51 | 100 % |
| The River by wooferzfg (on 20. March 2022, 06:24) | 42 | 96 % |
| Mehrdeutige Rätsel - Fillomino 2 by uvo (on 1. March 2017, 13:01) | 31 | 92 % |
| The Sailboat by Tom1i (on 23. August 2021, 12:44) | 26 | 100 % |
| Astronavigation by fjam (on 15. July 2023, 13:12) | 24 | 100 % |
| The Trident by GBPack (on 8. March 2022, 20:49) | 45 | 97 % |
| Lonely Killers by Yawnus (on 11. March 2024, 12:14) | 104 | 97 % |
| Triple Japasu III by Luigi (on 27. April 2018, 08:10) | 53 | 94 % |
| Sudoku Variants Series (323) - Killer Kropki Sudoku by Richard (on 2. June 2021, 00:00) | 58 | 96 % |
| Vault Door by Kafkapharnaum (on 4. June 2021, 17:44) | 22 | 91 % |
| Doubles Hidden Inside Squares (Double Trouble) by Mad-Tyas (on 8. September 2021, 13:28) | 15 | 98 % |
| Interjunction by MavericksJD (on 8. January 2022, 05:47) | 20 | 95 % |
| Border Vision by wooferzfg (on 15. April 2022, 03:53) | 38 | 97 % |
| Three Rights and a Wrogn by SirWoezel (on 29. July 2022, 13:47) | 16 | 95 % |
