The robot data files are formatted as follows:


Blue
Red
Yellow
Green
Class 1
Class 2
Class 3
Class 4


The first four numbers indicate the probability that each color of robot will appear in the level.  
These weights work the same as those in the powerups data file.  See "powerups data format.txt" for more info.

The last four numbers indicate the probabiltiy of each robot class appearing in a level.  If you only want the game to ever tell the player to build class 1 robots on level 1, then set all classes except the first to a weight of 0.