(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 Sum Sandwiches by RockyRoer (on 10. August 2025, 14:32) | 22 |  90 % |
| Another killer: no more, no less by ZeroNickel (on 21. August 2025, 20:55) | 29 | 93 % |
| Bewildered by NicoD (on 30. August 2025, 05:30) | 56 | 94 % |
| Lucerna (Large Myopia with Small Cave-Sudoku) by sfushidahardy (on 20. September 2025, 18:46) | 29 | 98 % |
| The NXT Step to Destruction by Donatello_86 (on 28. December 2025, 09:50) | 11 | 100 % |
| Counting Territories by masetab (on 17. January 2026, 14:33) | 16 | 100 % |
| Point Proven by oskode (on 21. October 2025, 09:40) | 82 | 97 % |
| To The Skies by Piatato (on 14. October 2021, 22:25) | 68 | 97 % |
| Siphon (Region Sum Lines) by tallcat (on 11. August 2022, 08:00) | 128 | 99 % |
| Threads of Silence by Prof.Dori (on 21. September 2025, 02:51) | 61 | 93 % |
| Killer Sandwich by Alexander Rappa (on 31. October 2020, 19:16) | 46 | 99 % |
| Lost Village (Lost and Found #5) by .proxz14 (on 8. March 2025, 13:32) | 154 | 96 % |
| Das Krypto-ABC-tje des Außerirdischen by ibag (on 22. August 2012, 14:56) | 31 | 96 % |
| Die Kryptos - S04E06: Kariertes Fillomino (Variante) by tuace (on 21. January 2020, 08:06) | 33 | 98 % |
| Scorpion by udukos (on 1. January 2022, 14:10) | 68 | 95 % |
| Metroid by Kafkapharnaum (on 30. December 2022, 17:24) | 35 | 99 % |
| Corner Piece by pieguy (on 26. February 2023, 21:07) | 35 | 95 % |
| Elementary by igniteice (on 21. December 2023, 02:40) | 41 | 91 % |
| Samurai-Sudoku mit Varianten by Pingu (on 6. December 2019, 02:33) | 61 | 90 % |
| Not too High, Not too Low by Cane_Puzzles (on 18. March 2023, 19:57) | 61 | 96 % |
