A cleaning test (conducted by KL-34N) must be passed before the Hero can participate in any Fossil Battles. He is required to earn a certain number of points in cleaning a head fossil - the same fossil is used in every test. The number of points required to pass the test starts at 50 and increases by 5 with each rank.
The Hero must win a battle against the rank's Master to level up. Later Level-Up Battles have preliminary matches, which the Hero must win to be able to fight that rank's Master.
Information about upcoming Level-Up Battles can be found on the second bookshelf in the Fossil Stadium lobby.
The cleaning test requirement is 55 points. The Level 1 Master is Wendy.
The cleaning test requirement is 60 points. The Level 2 Master is Nevada Montecarlo.
The cleaning test requirement is 70 points. The opponents in the preliminary battles are Eli and Sally, and the Level 4 Master is Nick Nack.
The cleaning test requirement is 75 points. The opponents in the preliminary battles are Jane and Mrs. Riggle, and the Level 5 Master is Dr. Diggins.
This level's preliminary battles must be won within 12 turns.
This level's master battle must be won within 10 turns.
The cleaning test requirement is 80 points. The opponents in the preliminary battles are Westley and Mr. Ozzlewit, and the Master Rank Master is Saurhead. This level's battles must be won without any of the player's vivosaurs being defeated.