Some 20,000 zombies storm a skyscraper of 200 stories with 1,000 people in it
Each zombie that enters building kills 1 person
But if player-controlled zombie reaches building it kills 40 people
If human count reaches 0 before zombies, you win
Take control of a zombie with Z
Walk with WASD
Dodge with SPACE
Enter spectator mode with X,C,V,B