Rocky is the champion of Spelunk. Instead of a classic "3 lives" battle, you will have to beat Rocky in a game of King of the Planet. He is much more difficult than Lupoze for his punch strength is very powerful. In order to win, you must have more points than anyone else. 4 fragments are required to enter the Spelunk main arena.
Rocky has shown signs of greed in the game & claiming himself "king of Spelunk". If you defeat him, he seems to be upset about losing his "purdy medal" since he would technically be so used to winning.