Dead Nation

Dead Nation is a top-down shoot 'em up video game for PlayStation 3 developed by Finnish video game developer Housemarque. It was released on November 30, 2010 in North America, and December 1 in Europe.
Players are awarded score multipliers and money when zombies are killed. Money is used to purchase and upgrade weapons on checkpoints, and multipliers to grant better scores. Each time players are hit, they lose multipliers and health