the game gets updated 1-2 times per month, its kinda long, lvl 0 you basically complete your main base, thats pretty much it, rebirth 1, you get a bigger garage added on. rebirth 2 you get a bunker. rebirth 3 you get helicopters rebirth 4 you get ww2 bunker, rebirth 5 you get nukes and drones, rebirth 6 gives you tanks, rebirth 7 you get fighter jets, then rebirth 10 you get the delorean, the delorean is an easter egg in the game, the thing can take 10 days to finish, and get the delorean, by that point you are very op and powerful, you are able to get a bunch of kills.