(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 | |
|---|---|---|---|
 | Counterrotation by Jay Dyer (on 14. November 2021, 02:42) | 16 |  94 % |
| Sudoku Variants Series (347) - Sudoku Connon by Richard (on 17. November 2021, 00:00) | 68 | 97 % |
| A riddle, wrapped in an entropic line, inside a sudoku by Raumplaner (on 24. April 2022, 15:17) | 14 | 93 % |
| HyperBan by mormagli (on 20. June 2022, 23:33) | 15 | 96 % |
| What Do Little Killers Eat? by RockyRoer (on 14. October 2022, 03:47) | 68 | 96 % |
| ZandwYch by ICHTUES (on 10. September 2023, 06:00) | 32 | 97 % |
| MILCHPRODUKT - Buchstabenrätsel / Letter Puzzle by DocLogic (on 6. October 2023, 13:56) | 31 | 97 % |
| Negative Energy by jojo81gaming (on 26. January 2024, 01:28) | 14 | 98 % |
| Quantum Superposition (Molecules, Whispers, Renban) by Crusader175 (on 22. July 2024, 16:00) | 18 | 92 % |
| Advent Calendar by Bearded Fool (on 1. December 2024, 12:00) | 96 | 97 % |
| Between a Relative and a Stranger by Elytron (on 30. September 2024, 00:47) | 17 | 98 % |
| These Two Equal These Two by EricRathbun (on 1. February 2026, 00:30) | 17 | 96 % |
| fractionated recollection by aqjhs (on 20. March 2025, 07:05) | 14 | 92 % |
| Sorry, could you repeat that? by chrisjnap (on 25. September 2025, 00:29) | 91 | 94 % |
| Volley Fire (0-9 Challenge) by The Bard (on 15. January 2026, 20:43) | 39 | 94 % |
| Peas Offering by Andrewsarchus (on 6. November 2025, 17:27) | 55 | 97 % |
| Polymorphic Rooms (collab with yttrio) by Bellsita (on 6. August 2023, 02:40) | 121 | 98 % |
| Clasped Cages by Cane_Puzzles (on 5. December 2021, 17:14) | 37 | 94 % |
| Schlangennest — mal anders by glum_hippo (on 19. March 2022, 16:57) | 43 | 96 % |
| Squiggles (Grkles Collab) by Niverio (on 15. June 2022, 00:37) | 38 | 97 % |
