Evil clone Santa and his insidious hordes of clone reindeer and snowmen have come to steal all the good childrens' Christmas presents. the 'Robo 5000' is one present that isn't going to take this lying down.
Start slow and easy on 'normal' mode or jump straight into the thick of the action on 'extreme'.
Use cursor keys or A and D to move and use the space bar to fire. Mouse (and space bar) can be used to navigate menus.