It would be kinda like Rampage, in that there are many rounds and it loads default builds, but instead, there are bots that try to kill you. You would get points for killing these bots, depending on what rank they are:
Fighter - Basic zombie, average attack and health. Low amount of points gained.
Basher - Large zombie, huge attack and health. Large amount of points gained. Can destroy bricks like a rampage player.
Dasher - Quake-like zombie, average attack and health. Basic amount of points gained.
Shooter - Shoots projectiles at you, low attack and health, somewhat low amount of points gained.
You start with a gun, and you can buy more weapons with points, however, you need a certain amount of points after a certain amount of time to pass the round. You can access the shop by typing "/buy". Then a list of items you can buy will show up, then you type "/buy [itemname]" You carry your weapons to each round, so you wont need to buy them for each round, and to save points for future rounds.