Incursion is a tower defense/RTS hybrid similar to Kingdom Rush. Prevent your enemies from passing through each area by training defenders in the barracks along the path. Each barrack has three basic defenders: a footman, an archer, and a sorcerer. Once trained, defenders can be moved on the map, but not too far from their respective barracks. You will be allowed to upgrade your units when a barrack houses the maximum number of units. Training and upgrading units requires coins, which are earned by killing enemies and sending out waves early. Sometimes, spells will appear on the map; click on a spell to activate it. When you win a battle, you will receive crystals that can be spent on skills.