(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 | |
|---|---|---|---|
 | Skyscraper Index by jwsinclair (on 11. July 2022, 19:32) | 16 |  97 % |
| The Big Renbans by Nai Night (on 18. February 2023, 22:00) | 23 | 95 % |
| Beehive [Hexagonal Akari RGB] by wisty (on 27. December 2023, 02:16) | 18 | 97 % |
| LM 2024 Leftover: Extra Region U-Bahn by uvo (on 21. June 2024, 12:00) | 37 | 96 % |
| Looking Left by Md88keys (on 21. July 2025, 15:00) | 25 | 91 % |
| Lizard's Lunch by EdTheAlchemist (on 22. January 2026, 15:26) | 27 | 90 % |
| Don't you fear the drumsticks by chameleon (on 26. February 2023, 12:41) | 72 | 94 % |
| Colorguru Chaos Deconstruction by crispy16 (on 30. May 2022, 03:09) | 53 | 97 % |
| Straddle by marty_sears (on 26. December 2023, 22:35) | 95 | 96 % |
| Sudoku Variants Series (279) - Parity Sections Sudoku by Richard (on 29. July 2020, 00:00) | 73 | 98 % |
| Whose Line is it Anyway? (Region Sum, Renban, Global Entropy) by Chefofdeath (on 16. June 2024, 18:21) | 40 | 92 % |
| Hex Masyu with Branching by kiwijam (on 26. April 2013, 04:39) | 63 | 96 % |
| Two-Doku Xtreme by Stavros96 (on 3. October 2020, 03:53) | 16 | 98 % |
| Star Nurikabe N± by BenceJoful (on 2. October 2021, 02:24) | 30 | 94 % |
| arROw SudOkU - wHisPErinG cYCle by filuta (on 26. October 2021, 23:09) | 15 | 94 % |
| The Violin by XeonRisq (on 21. December 2022, 19:00) | 19 | 96 % |
| A38 + Enge Höhle (Permakultur) by ibag (on 1. April 2024, 11:44) | 14 | 98 % |
| Watchtowers by oskode (on 28. August 2024, 18:26) | 18 | 92 % |
| This is how you learn the Time War by pdyxs (on 26. February 2025, 04:51) | 14 | 96 % |
| Rocket launch (Damo Collab) by palpot (on 23. March 2025, 21:54) | 35 | 93 % |
