For a quick, free shot of Christmas fun, you could do worse than Santa's Gift Drop. The download file is the Flash game itself, not an installer, so be sure to save it where you can find it again. You control Santa's sleigh, which has an elf riding shotgun in back. Santa delivers presents to houses with the space bar, while the elf shoots aliens with the left mouse button. (The instructions say to use the space bar to fire upon the pursuing alien spacecraft, but that's incorrect.) You can move up and down with the mouse, or just stay at one level and shoot. The game ends when an alien craft runs into the sleigh. You can't change any settings or configure controls, and there's no music. Minimalists may enjoy the simplicity of Santa's Gift Drop.