(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 | |
|---|---|---|---|
 | Teamwettbewerb 2011: Rätselstern (Runde 1) by SilBer (on 30. March 2011, 20:52) | 64 |  97 % |
| A Beautiful Nightmare by Allagem (on 3. March 2024, 11:22) | 72 | 90 % |
| Anti-Knight Uprising by Scruffamudda (on 4. April 2024, 05:42) | 66 | 94 % |
| Sudoku Variants Series (177) - Frameless Sudoku by Richard (on 18. April 2017, 00:00) | 103 | 93 % |
| Zerteilter Rundweg (4) by BFaw (on 9. October 2012, 10:00) | 36 | 92 % |
| Rudolph? by ThePedallingPianist (on 22. November 2022, 23:38) | 72 | 96 % |
| Killer RBC1-6 by RockyRoer (on 3. February 2023, 11:42) | 33 | 94 % |
| Smog in the City (Fog, Skyscrapers) by Chilly (on 13. January 2025, 19:52) | 79 | 92 % |
| More Unique Arrows by Jolly Rogers (on 28. December 2025, 11:51) | 75 | 95 % |
| Magnet+Antimagnet-Verrückte Welt der Pole by r45 (on 11. August 2010, 16:28) | 69 | 92 % |
| Full Lashing by Joseph nehme (on 1. May 2021, 08:34) | 40 | 98 % |
| Battle With The Archers - The 14th Target: Archer's Illusion by Playmaker6174 (on 2. September 2021, 16:13) | 40 | 97 % |
| A Zip of Blood (Vampires, Zippers) by gdc (on 13. March 2024, 17:46) | 43 | 94 % |
| Seance by mathpesto (on 17. February 2025, 23:36) | 80 | 97 % |
| split pearsonality / dopealgänger by aqjhs (on 2. November 2025, 23:53) | 42 | 98 % |
| Embedded Sandwich Sudoku - Taco Bowl by DiMono (on 8. March 2021, 06:41) | 40 | 97 % |
| Put a ring on it (if you like it) by Ali M (on 26. March 2024, 16:32) | 49 | 94 % |
| Royal Isolation by Jacoba (on 8. September 2025, 17:24) | 50 | 91 % |
| Dreams by Zibl (on 15. November 2025, 19:06) | 88 | 98 % |
| Kakuro-Koralle by ibag (on 5. September 2013, 23:55) | 79 | 96 % |
