Choose a map, to switch between maps you have to click one of the 2 arrows, then click a mode, after that click the start wave button on the top left to start the wave, open the shop then you can purchase towers to defend against the horde Click the black arrow square button to open the tower shop then if you have enough money, you can click a tower you want to use and place it anywhere in the map where you want it, there can be stuff in the way of your placement so place it somewhere you can You can click the cancel button if the purchase was an accident (you can’t sell once u placed it down, will make it soon)
