(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 | |
|---|---|---|---|
 | Latent Entanglement by 99%Sneaky (on 14. February 2025, 18:15) | 81 |  96 % |
| Which Room Were We In? by ChinStrap (on 13. January 2026, 18:56) | 32 | 92 % |
| Toroidales Tapasyu 2 by usp (on 25. October 2014, 00:00) | 59 | 98 % |
| Woof! by zegres (on 1. August 2022, 07:13) | 79 | 97 % |
| Transmission by Phistomefel (on 18. January 2023, 17:39) | 286 | 97 % |
| PYRAMIDE - Buchstabenrätsel / Letter puzzle by DocLogic (on 3. February 2020, 18:21) | 37 | 95 % |
| Dense Populations by Mark Sweep (on 5. March 2021, 10:00) | 22 | 97 % |
| A + N ∞ (Palindrome + kropki sudoku) by Aspartagcus (on 16. July 2021, 00:02) | 21 | 97 % |
| 4'33" by ndsurgenor (on 28. September 2021, 15:35) | 36 | 97 % |
| Just Knights and Arrows by GBPack (on 18. November 2021, 21:53) | 23 | 90 % |
| Nonconsecutive Palindrome Sudoku #1 by GBPack (on 24. November 2021, 22:15) | 20 | 92 % |
| Growing Up by the_cogito (on 22. December 2022, 19:43) | 41 | 99 % |
| This is it. I've done it. by EricRathbun (on 23. April 2023, 00:19) | 59 | 97 % |
| Walkie Talkie (choco banana-ten lines sudoku) by Ambrose (on 26. January 2025, 00:00) | 16 | 94 % |
| GCF by RockyRoer (on 14. February 2025, 14:39) | 17 | 97 % |
| Petit Pois by ThePedallingPianist (on 7. May 2025, 10:55) | 68 | 94 % |
| Sorry, could you repeat that? by chrisjnap (on 25. September 2025, 00:29) | 90 | 94 % |
| Inception by Joseph nehme (on 8. May 2021, 07:42) | 63 | 96 % |
| Dadly Sandwich by Cane_Puzzles (on 30. June 2022, 17:11) | 43 | 96 % |
| Stranded Friends by DarthParadox (on 14. July 2023, 00:12) | 44 | 92 % |
