(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 | |
|---|---|---|---|
 | Crossroads by Knickolas (on 3. April 2023, 13:12) | 33 |  97 % |
| Double Killer Sudoku by clover (on 15. December 2023, 21:57) | 35 | 99 % |
| B-Sides: In a Pinch (irregular squishdoku, arrows) by DubiousMobius (on 25. February 2026, 01:21) | 18 | 93 % |
| Jörmungandr by Jay Dyer (on 2. June 2022, 13:46) | 186 | 99 % |
| Summation U-Bahn Cipher by Agent (on 3. October 2023, 09:00) | 59 | 100 % |
| Fillomino Aquarium by Phistomefel (on 16. January 2022, 00:44) | 92 | 100 % |
| The Fifteenth Day of Christmas by cristophermoore (on 18. December 2022, 07:01) | 51 | 98 % |
| Enlightningment (Sudokuvania boss) by SkepticalMario (on 30. May 2025, 07:00) | 123 | 91 % |
| Building between by Paletron (on 10. August 2023, 20:20) | 59 | 96 % |
| Fifteen by Die Hard (on 20. March 2024, 00:27) | 28 | 98 % |
| Medieval Buffet by Manta-Ray (on 16. September 2024, 14:11) | 32 | 95 % |
| Chaos Construction: Liar Japanese Sum (9x9) by Playmaker6174 (on 22. August 2025, 23:00) | 34 | 100 % |
| Broken Gift (Partial Irregular Killer Sudoku) by peterchayward (on 16. May 2021, 11:42) | 42 | 92 % |
| Flat Cosmos (Chaos Construction) by sfushidahardy (on 13. August 2024, 23:53) | 84 | 99 % |
| Boogie by Andrewsarchus (on 21. March 2025, 05:18) | 43 | 92 % |
| Non-Consecutive Territories by masetab (on 9. December 2025, 14:21) | 119 | 96 % |
| Loses Kalenderblatt April 2019 (2/2) by April (on 1. April 2019, 12:00) | 24 | 99 % |
| Roller Coaster mit Extras 17 by Uhu (on 9. April 2020, 20:36) | 38 | 98 % |
| Sandwich Fillomino #1 - Vicious Circle by Mark Sweep (on 19. March 2021, 10:00) | 14 | 98 % |
| 6556 by abed hawila (on 23. March 2021, 21:07) | 23 | 99 % |
