True old-school gamers will definitely want to keep track of time with this Space Invaders Calendar. This calendar has one year on a single sheet and features all of the characters from the arcade classic.
The Space Invaders Calendar can be a tad bit confusing to use, as the months are only organized by color and not by date. Still, if you or someone you know is a certified hardcore gamer, this calendar would make an awesome Christmas gift. Hint, hint.