You can spend Energy to play a Cash Builder round and answer questions to earn Cash.
You can then spend some of that Cash together with Energy to play a Chase round. Choose from one of the offers, then answer questions correctly to outrun the Chaser and add the Cash to the Prize Pot for the Final Chase, and earn a Headstart.
As long as you have enough Cash and Energy you can play as many Chases as you like. Winning more Chases increases the Final Chase Prize Pot and gives you additional Headstarts (up to a maximum of 3).
When you're ready to try to win you Prize Pot you can spend some Energy to start the Final Chase. Do better than The Chaser in the Final Chase to win the contents of the Prize Pot.
Winnings any of these rounds help you move up the League Leaderboards.