I gave his save roll the test to make stuff also he had a double save.
I used the Science attribute in my Dr. Who games. It was something like 16, depending on whether it was The Doctor, Romana, or Liz Shaw. I didn't want something that would allow everyone to defeat the Daleks or Sontarans to be invented on the first turn, so I made a "record track." This started at minus ten and worked its way toward zero. The first turn one of the Main Characters tried to invent something, he or she had to apply this modifier to the die roll. In that way, it was impossible to pass a Science roll on the first turn, but you couldn't just wait until turn 10 to start inventing.
Each inventor could only invent one thing per game.
One example of an invent item was a device that cut a Dalek's
Save number in half if the invention was within some number of inventions of the Dalek. Since my Daleks had
Save numbers of 20, you either needed this invention or a heavy weapon with a good SRM.
Buck