(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 | |
|---|---|---|---|
 | Confluence 2: Dumediat Birthday Edition by mathpesto (on 31. August 2023, 17:41) | 62 |  99 % |
| BYO RSL by mathpesto (on 5. November 2023, 15:55) | 31 | 94 % |
| 1234 (Arrow Sudoku) by ProRock (on 24. June 2024, 15:21) | 31 | 90 % |
| U-Bahn with Empty Cells by Niverio (on 28. June 2024, 21:23) | 31 | 99 % |
| five boxing wizards by aqjhs (on 6. January 2025, 07:53) | 38 | 90 % |
| Impossible Germany by Neokart (on 28. October 2024, 02:41) | 30 | 96 % |
| Cutting Corners (by jovi_al & Qodec) by Qodec (on 4. September 2021, 10:44) | 52 | 97 % |
| Tag 20 - Shakashaka by CJK (on 11. February 2021, 14:56) | 29 | 95 % |
| Optimization by djorr (on 23. June 2021, 16:10) | 19 | 97 % |
| Six-pack Linked Sudokus #8 by Genomico (on 15. September 2021, 04:10) | 40 | 99 % |
| Multiplied Cages by RockyRoer (on 2. December 2021, 03:40) | 19 | 93 % |
| 89 Years After 2015 by LittleNightmaresLady (on 12. April 2023, 18:04) | 20 | 96 % |
| Uneasy Alliances by ViKingPrime (on 30. May 2024, 16:00) | 18 | 93 % |
| Glass Half Summed (Chaos Construction) by sfushidahardy (on 25. August 2024, 01:10) | 58 | 98 % |
| Costco Run: Mixed Nuts, Bananas, Sudoku? (4,14) by Scojo (on 1. February 2025, 11:34) | 18 | 97 % |
| Smallhat by the_cogito (on 21. April 2022, 17:27) | 53 | 95 % |
| Roller Coaster mit Extras 3 by Uhu (on 20. January 2018, 12:49) | 61 | 98 % |
| Consecutive Sudoku by AstralSky (on 28. November 2022, 18:01) | 38 | 92 % |
| BAUERNHOF - 3D-Buchstabenrätsel / 3D letter puzzle by DocLogic (on 24. July 2023, 15:15) | 31 | 97 % |
| I Only Have Eyes For You by juggler (on 24. May 2024, 17:47) | 43 | 97 % |
