Cards are used along with Energy Drinks to upgrade a Manager or Business.
The cost increases with each upgrade, so you will need more cards and energy drinks each time.
The cost increases with each upgrade, so you will need more cards and energy drinks each time.
In the example above, Robbing Hood is level 1. The 1/5 indicates that you have only 1 Robbing Hood Card and need another 4 to upgrade him and to pay another 250 energy drinks. When upgraded to level 2, his bonus is to increase the speed in all Businesses by 2!