You will be the commander of your side and your responsibility is to protect the storage from monsters. The enemies move faster on the roads and so it is advised that you place the towers on the roads to divert their path off the roads to slow them down. The monsters will need to make it through the checkpoints before reaching the storage and so you must place the towers tactically. The tutorial in the game helps you understand the game play better and you will do yourself favor by checking it out. If you think you are capable of carrying out the defense-based tasks, you may start. The game is to be played in normal, hard, extreme and survival modes.