(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 | |
|---|---|---|---|
 | Geometry Exam #3 by Blashyrkh (on 7. August 2023, 19:46) | 50 |  94 % |
| Twin Killer Sudoku by Richard (on 23. January 2009, 10:36) | 134 | 95 % |
| 58 by Qodec (on 10. October 2020, 16:34) | 45 | 97 % |
| Sum Thing Irregular by tallcat (on 3. November 2022, 19:41) | 42 | 95 % |
| Entroban by jcgodart (on 11. December 2022, 04:56) | 47 | 97 % |
| Ocean Spray by Florian Wortmann (on 6. February 2024, 18:50) | 92 | 95 % |
| Modular Region Sum Lines Sudoku by Phistomefel (on 7. March 2024, 20:52) | 134 | 98 % |
| Mirrors by jovi_al (on 9. June 2021, 06:25) | 88 | 98 % |
| Rätselwochenende: Table for Four - Battleship by uvo (on 26. November 2014, 16:40) | 39 | 94 % |
| LM-Training: Japanisches Summen-Masyu by rob (on 4. June 2018, 23:22) | 43 | 93 % |
| Double-Digit-Thermo I "The Tree" by Garford (on 23. January 2021, 19:04) | 53 | 96 % |
| Angels by goodcity (on 8. October 2023, 18:03) | 45 | 93 % |
| The Renban Code by juggler (on 18. August 2024, 12:10) | 43 | 94 % |
| The Devil is in the Details by Gliperal (on 31. October 2020, 02:50) | 45 | 97 % |
| Goldilocks by SudokuExplorer (on 25. May 2021, 01:00) | 44 | 93 % |
| Setting the Scene by PjotrV (on 14. October 2021, 15:23) | 42 | 94 % |
| Position Sums (9x9 Chaos Construction) by ONeill (on 18. October 2022, 16:45) | 47 | 100 % |
| Zippery When Wet by marty_sears (on 20. November 2023, 03:01) | 137 | 99 % |
| Battle With The Archers 8 - The Climax: Odd Crossroad by Playmaker6174 (on 19. July 2021, 13:00) | 40 | 97 % |
| Double or Half (killer sudoku + star battle) by Al Fresco (on 14. November 2022, 21:31) | 41 | 95 % |
