(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 | |
|---|---|---|---|
 | Your Move, Creep by EdTheAlchemist (on 1. January 2026, 17:17) | 16 |  90 % |
| Four Easy Pieces by Andrewsarchus (on 3. January 2026, 22:24) | 46 | 92 % |
| Hammerhead by cygne (on 7. January 2026, 17:29) | 65 | 95 % |
| Some Self-Referential Arrows Somedoku by blackjackfitz (on 27. March 2026, 18:42) | 18 | 93 % |
| Convicted red droplets by NicoD (on 1. May 2026, 05:30) | 51 | 95 % |
| RAT RUN 30: Star Rats by marty_sears (on 18. March 2026, 01:00) | 501 | 99 % |
| Scylla (Killer Sudoku) by Phistomefel (on 8. September 2025, 22:41) | 157 | 94 % |
| Knights & Archers hold the Line by Florian Wortmann (on 30. January 2022, 14:54) | 104 | 97 % |
| Noughts and Crosses Somedoku by blackjackfitz (on 29. March 2024, 18:41) | 89 | 97 % |
| 2025 Chaotic X-Sums (9x9) by Florian Wortmann (on 25. January 2025, 14:34) | 167 | 98 % |
| Lumos Maxima by chameleon (on 5. October 2022, 16:10) | 640 | 95 % |
| Medúlla by mathpesto (on 7. March 2025, 01:05) | 157 | 97 % |
| Crimson weathercock by NicoD (on 26. April 2025, 05:30) | 65 | 92 % |
| *100* Doppelter Pentomino-Rundweg by Richard (on 17. June 2009, 21:00) | 103 | 95 % |
| Renban Skyscrapers (CTC 400k subscribers) by Florian Wortmann (on 3. October 2021, 12:42) | 51 | 91 % |
| Shade Some More Sum Lines by Xendari (on 23. August 2023, 07:51) | 54 | 98 % |
| Tenfinity by ThePedallingPianist (on 23. November 2025, 18:45) | 55 | 95 % |
| Life on 36 cells by Phistomefel (on 13. January 2021, 00:42) | 105 | 95 % |
| Baby Dragon by zetamath (on 18. November 2022, 17:23) | 158 | 96 % |
| Taron [Fog of War] by IcyFruit (on 23. May 2024, 13:16) | 174 | 97 % |
