I encountered 2 bugs during my attempts at brutal difficulty
the first is that occasionally, one card either doesn't exist or appears invisible. A blue four was missing, but as soon as I cleared the blue 5, it moved to the blue 3 on it's own.
the second is I couldn't seem to move a stack off the 2nd slot of the finish pile, thus softlocking me from finishing even though the 3 other stacks were complete. Other than that, fun brain stretcher of a game