Tech Levels are representations of technologial advancement in the game. Each new Tech Level gives the player access to new units, buildings, and technologies.
There are four Tech Levels in the game:
Players can advance to the next Tech Level by researching it at the Command Center. To do this, they need two buildings from the current Tech Level, and must pay a certain amount of Food and Nova. To move from Tech Level 1 to Tech Level 2, they only need to pay Food, but need to build three buildings.