Ancient Planet follows the classic tower defence game format - as keeper of an ancient civilization's galactic wisdom, you're required to build a base and defend it against enemy attacks using a variety of defence towers. As the game progresses, you'll be awarded precious gems, and these can be used to purchase upgrades and unlock new towers to aid the fight against your aggressors. Ancient Planet features a range of unique enemies, each with different characteristics, so you'll need to plan carefully and be prepared to change tactics as the levels progress.