Expanding your unit box

You start off with a maximum of 20 units in the game, but you can increase the number of units you can hold to 200.

It costs 100 stones to increase the number of units you can hold by 5.

3. You’ll get a message telling you that it costs 100 stones for the expansion. Tap the blue icon if you want to go ahead, and the red one to cancel.
You can only increase the number of units you can hold in blocks of 5, so you’ll have to keep repeating the same process if you want to add more.