I really enjoy play this game on my computer and would love to bring it with me.
Program: Warzone 2100
License: GNU General Public License
Description: "Warzone 2100 is a real-time strategy game, developed by Pumpkin Studios and published by Eidos-Interactive™. Although comparable to Earth2150™ in many significant aspects, it does contain some that are unique. These include various radar technologies, a greater focus on artillery and counter-battery technologies, as well as a different vehicle design method. It was released in 1999 for PC and Playstation®. " (from the website)
Other: The game is similar to Command And Conquer. It is continuously updated and is backed by several companies. There are very few registry entries (less than 10) to worry about.