In short: JusTD is a Tower Defense game with resource- and base management! The gameplay is simple. You need to expand the map by revealing previously hidden sections as long as there are any, then you need to start the wave! In each wave different amount or type of enemy robots will spawn and will try to reach your main tower, or if they can they will damage your other buildings and turrets. In certain waves boss-level robots will appear with significantly higher stats and if they reach your base, the mission is immediately over! You can build and sell your buildings, but your turrets level up as they attack the enemies, and they become stronger and stronger, so it is better to keep an eye out for keeping them in one piece! You also need to mine minerals and refine them to have resources! The resources can then be used to build or repair buildings and turrets, or to produce ammunition. There are only a limited amount of spaces for your buildings, so you need to choose wisely what and where to build!