Not So FastG 10

This is likely to unlock naturally if you play on easy, but if you just can't seem to get over the hump, create a backup of your save files at the beginning of the special stage (before choosing your difficulty), and play as normal. If you fail to capture the villain, close the game, replace the save files in the game folder with your backup, load the game up, and try again. (See my forum post for more detail on this method)