Splitkick: You are not Gordon Freeman. You are not the Vault Dweller. You are, however, a silent protagonist faced with overwhelming odds.
The story, such as it is, begins on the beach. In your hands is a pistol. Ahead of you is a massive level modeled after a bucolic Eastern-bloc. Aside from a handful of other survivors, it is populated entirely by zombies, the exact number on the server that is publicly displayed to taunt you. We’re not told how it happened, nor why, nor why you’re even here. Maybe the heroes come from the sea, but if you’re like me, you’re a bandit come to strip what’s left of value from the land.
In either case, the imperative is the same: survive for as long as you can.