Only the current version so far — new entries appear as the game ships updates.
You start with one soldier on a road that only goes forward. Steer him with your thumb. He shoots on his own.
Shoot the gates ahead of you to turn their red numbers green, then walk through and watch one man become twenty, then hundreds.
Enemies come at you in packs, walls block the road, and a boss is waiting at the end of every level.
