UPDATE: Trials Frontier uses an energy system to limit the amount of time you can play in one session.Each race costs fuel to play, but you can buy more using the in-game diamond premium currency, Digital Spy reported.
"You're not going to be able to sit and binge for two hours straight on the game without running out of fuel," Redlynx designer Justin Swan explained. "You'll just have to wait to get enough fuel."
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