Mars Commando is a defense game that takes place on, you guessed it, Mars. Recruit and strategically position space marines to fight off waves martians that are trying to destroy your station. There are different types of units, each with their own strengths and weaknesses. The price of a unit increases with each recruit. There is a limit to how many units you can have on your roster, but you can reserve or retire any unit. In addition to recruitment, your money can be spent on fortifications and equipment. Make sure you preview the upcoming wave before you start it and position your units accordingly. Your units can't be arranged during battle, but you do have control of a droid, which can shoot enemies or heal units.