As you see, I've been playing Pyramid Solitaire for a while. But never have I encountered a level like 4606.
While others have been challenging, they are still beatable. Level 4606 is not beatable within anything other than million to one pure luck - or, as is clear, one spends far too much on "extra" help.
Excuse my direct comment - but 4606 is nothing more than an unfair money grab and shameful exploitation of the players.