The verification algorithm has been changed
There is no longer a binding to a pre-generated variant. By increasing the level of difficulty, you also increase the variability of the solution.
There is no longer a binding to a pre-generated variant. By increasing the level of difficulty, you also increase the variability of the solution.
Original post 
In the global leaderboards/leaderboards of friends, added statistics on the time for which the puzzle is solved. Lists are divided by size and difficulty.