(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 | |
|---|---|---|---|
 | Sudoku Variants Series (465) - Productive Killers by Richard (on 1. May 2026, 06:00) | 41 |  93 % |
| Mounted Archers by NurglesGift (on 24. October 2025, 20:15) | 54 | 92 % |
| Pseudo Cluedo by marty_sears (on 6. April 2024, 01:13) | 113 | 98 % |
| Cursed Quiver 2 (Region Sum Arrows CC) by Xendari (on 16. December 2022, 08:13) | 54 | 98 % |
| Low Tide by Schwupel (on 18. August 2023, 21:25) | 53 | 91 % |
| Quantum Counting by gdc (on 17. November 2024, 13:39) | 62 | 97 % |
| Two-factor by FKlauser (on 6. June 2025, 11:11) | 56 | 98 % |
| Addition by Subtraction by Cane_Puzzles (on 22. August 2025, 16:57) | 54 | 96 % |
| InTENtions UnkNown by Calvinball (on 16. February 2026, 03:46) | 46 | 97 % |
| Fisherman's Pinwheel by ClashCode (on 24. January 2023, 23:54) | 59 | 91 % |
| X---V*Whisper by NurglesGift (on 11. October 2025, 14:38) | 66 | 95 % |
| Schrödinger's Dots by starwarigami (on 18. December 2021, 02:34) | 55 | 99 % |
| 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 % |
| Triple Decker (Between Sandwich) by tallcat (on 3. August 2022, 17:53) | 66 | 97 % |
| Huey, Dewey, Louie by Crusader175 (on 3. September 2022, 15:00) | 76 | 97 % |
| Spring Latch by Qodec (on 13. October 2023, 22:07) | 81 | 94 % |
| Sudoku Variants Series (303) - Assorted Sandwiches Sudoku by Richard (on 13. January 2021, 00:00) | 84 | 98 % |
| Fat X (little killer sudoku) by Aspartagcus (on 9. March 2023, 18:46) | 93 | 95 % |
| Rundweg andersrum 3 by Menxar (on 14. September 2009, 10:10) | 48 | 95 % |
