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the 'Extra Perk Slot' icon without stars.
There are many different perks that all help in some way. Perks can be gained via the upgrade screen. It costs two upgrade points to unlock a new perk with the exception of the last upgrade which costs five points.
Perks can be equipped at the beginning of each game. Only one perk can be used in a game unless the player has unlocked the 'Extra Slot Perk' which allows usage of two perks at a time.