Doom as an interface to kill processes exists for quite some time now.
However there is a new nice idea. Wolfotrack enhances Wolfenstein3D to use the conntrack extension of netfilter and links each person in the game to a connection from the connection tracking table, If you open a door the table will be refreshed.
Each person is linked to a connection from the conntrack table if it exists. Everytime a door is opened this connection tracking table is refreshed. If you kill the person in the game you kill the associated connection.