To have any chance of winning tournaments you will need to earn gems so you can spend them on boosts. Completing quests will allow you to get those gems for free. You can also place planes onto the track and just let them race around endlessly for awhile.
in fact, How do you get free money on Merge plane?
The first way to get unlimited money is to sign in, collect your offline income, and then set the time ahead by a few hours and collect offline income again. Keep doing this as many times as you want, in order to end up with gigantic amounts of income.
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