(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 | |
|---|---|---|---|
 | MeidjulOOp ! [Meidjuluk N=18; Loop] by Christounet (on 25. October 2023, 21:54) | 40 |  98 % |
| Fair and Square (Equality Cage + Arrow) by Schwupel (on 14. November 2023, 21:58) | 40 | 92 % |
| Doublers Make Me Loop-Pea! by SamuPiano (on 9. September 2024, 15:44) | 38 | 93 % |
| They check in, but they don't check out by Strosahl (on 3. October 2024, 06:13) | 48 | 94 % |
| Criss Cross by FullDeck-Missing (on 19. July 2022, 15:04) | 53 | 93 % |
| Cursed Quiver 2 (Region Sum Arrows CC) by Xendari (on 16. December 2022, 08:13) | 51 | 98 % |
| Low Tide by Schwupel (on 18. August 2023, 21:25) | 53 | 91 % |
| Two-factor by FKlauser (on 6. June 2025, 11:11) | 55 | 98 % |
| Addition by Subtraction by Cane_Puzzles (on 22. August 2025, 16:57) | 52 | 96 % |
| Reign of Cassiopeia by Tyrgannus (on 24. June 2022, 06:25) | 63 | 95 % |
| Epiphany (Numbered Room and Region Sum Line) by Playmaker6174 (on 30. September 2022, 10:32) | 59 | 97 % |
| Thermometer-Hochhäuser, 8x8 by pirx (on 12. December 2013, 18:08) | 63 | 94 % |
| Triple Decker (Between Sandwich) by tallcat (on 3. August 2022, 17:53) | 66 | 97 % |
| Jubiläumsrätsel - 2 Jahre Rätselportal by Richard (on 1. November 2010, 00:00) | 70 | 94 % |
| Sudoku Variants Series (418) - Sum and Product Killer by Richard (on 4. April 2025, 12:00) | 77 | 96 % |
| Fat X (little killer sudoku) by Aspartagcus (on 9. March 2023, 18:46) | 92 | 95 % |
| Madrigal by Fafrd (on 1. January 2023, 17:41) | 117 | 94 % |
| Rundweg andersrum 3 by Menxar (on 14. September 2009, 10:10) | 48 | 95 % |
| Schlingerpfad 11x17 by adam001 (on 20. September 2012, 13:56) | 18 | 93 % |
| Die Kryptos - S03E04: Summon by tuace (on 30. October 2018, 10:14) | 50 | 99 % |
