(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 | |
|---|---|---|---|
 | Fireworks (Killer Arrow Sudoku) by FryTheGuy (on 2. June 2021, 07:12) | 20 |  91 % |
| Wanda's Hex by fjam (on 25. September 2021, 11:00) | 15 | 96 % |
| Jellyfish by grkles (on 15. October 2021, 01:49) | 25 | 98 % |
| Tight Fit by TotallyNormalCat (on 30. December 2021, 19:00) | 58 | 98 % |
| Crypto Japanese Cave (Fillomino) by KNT (on 5. November 2022, 16:24) | 48 | 98 % |
| Trimodi (Modifier Entropy) by Mad-Tyas (on 10. January 2023, 00:48) | 18 | 95 % |
| Sandwich gone BAD by PrimeWeasel (on 3. March 2023, 17:59) | 14 | 100 % |
| Wichtel 2022 (4): Traditionelle Japanische Summe by wichtel (on 20. September 2023, 11:11) | 16 | 100 % |
| Wichtels Rätselsommer 2024 (6): Ein seltsamer Mischmasch by wichtel (on 9. September 2024, 20:23) | 24 | 100 % |
| Summation U-Bahn #4: Skyscrapers by Agent (on 30. September 2024, 09:00) | 40 | 100 % |
| The Light Maze (Chaos Construction, RGB) by Chilly (on 7. January 2025, 16:15) | 34 | 99 % |
| The Lost Sums of Akator by Oripy (on 21. April 2025, 12:00) | 19 | 100 % |
| Tetrafolium by Myxo (on 17. February 2025, 15:40) | 95 | 97 % |
| Zodiac Project: Cluster of Galaxies by Prof.Dori (on 6. November 2024, 00:51) | 48 | 98 % |
| Numbered Blocks by Chad (on 14. February 2024, 23:33) | 33 | 95 % |
| Seeing Around the Corner by Die Hard (on 8. July 2024, 00:07) | 34 | 98 % |
| Pandemonium (Chaos Construction) by Sotehr (on 20. September 2025, 06:00) | 33 | 95 % |
| Pompeii by Kafkapharnaum (on 25. October 2025, 23:10) | 39 | 99 % |
| Wheel of Arrows (arrow + little killer sudoku) by Aspartagcus (on 6. April 2021, 12:20) | 50 | 96 % |
| TE-N [Liar JSCC Ten Line] by Christounet (on 4. July 2024, 14:55) | 23 | 99 % |
