Upgrading a player is simple! Collect player cards until you see a flashing up arrow on your desired player on the squad screen, then tap on the player you wish to upgrade, and tap “UPGRADE”. All upgrades require a Bux currency cost to complete, so make sure you have enough.
For example, upgrading a player from Level 1 to 2 requires 10 player cards for that player to be collected, and will cost 300 Bux to complete.
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