Since this is very hard to be understand, i will explain it you. The challenge said that you need to click (333(333)333)^..(333(333)333)..^(333(333)333) times to win, right? Well (333(333)333) means that 333(333 knuth arrow)333. So, by the same explanation the number will be equal to (333(333 knuth arrow)333)↑..((the value of (333(333)333)) many knuth arrow)..↑(333(333 knuth arrow)333) Also ^ = ↑

Basically, you have to click infinite amounts of times.