These "credits" were used to purchase upgrades in the in-game store.

This can then used to purchase weapons and upgrades.

Each civilization can purchase upgrades that increase the rate of gathering these resources.

You may also purchase upgrades to your environment.

If enough Research Points, players can purchase upgrades to their race.

In order to support Reign's costs, its developers have created a system whereby users can purchase upgrades to their account.

These are used, in a currency format, to purchase further enhancements and upgrades.

The points are used to purchase weapons and upgrades.

Between each level the player is given the opportunity to purchase upgrades.

Players can purchase upgrades using money obtained from these optional activities and by mining gold veins.