How Do You Get Free Currency?

Adverts

Makes sure you take advantage of watching the adverts whenever the opportunity presents itself, especially when there are rarer rewards available and you haven't guessed the chests they are hiding in as doing so will give you a shot of opening 3 extra chests after successfully completing a battle.

Missions Map

Keep an eye on the missions map and tap on the treasure chests that appear every now and again as doing so will give you much needed free currency. You will find that these treasure chests will refresh every couple of hours. Make sure you also scour the parts of the map you have not yet unlocked for them.

Orbs

The orbs which are used to build sculptures with are very rare and are won in chests through battles and when you upgrade your city level. The chances of you winning orbs are low compared to other resources. You will not receive orbs as a prize until mission 40.

Big Gems

A way to receive big gems is to destroy a small sculpture. Instead of receiving several small gems you will receive one large one.