The first unit in the game. They are very cheap and effective, and can deal decent damage to a single zombie or horde. They are currently the fastest unit in the game (4 tiles per second), making them great for scouting or escaping zombies.
Heading: They are billions
Guides and Tips for They Are Billions.
Detailed walkthrough of They Are Billions. How to repel the final wave, what to do with the Lost Village, and where to place the market and the bank correctly.
At the moment, the game has 4 difficulty modes and several hordes of zombies. The higher the difficulty and the larger the zombie horde, the faster you will unlock the next colonies.
If there are practically no trees in your starting position, immediately restart the map. 70% of game maps are generated randomly, and you need a lot of trees (grass is optional).