How do I upgrade equipment?
You can upgrade your equipment in the Upgrade section of the menu for the selected inventory item. Upgrade equipment to boost its stats. Note that every upgrade requires Bucks and Parts. You can go straight to Max Upgrade to avoid tapping multiple times. Downgrade a piece of equipment to get 100% of the currency you invested back. Before you go into battle, make sure you've got all the stuff you need to be unstoppable.