While traversing the various Space Battle levels, you may be mystified as to what the "Extra Targets" are that are mentioned at the end of each level. For instance, at the end of a level, you might be told that three of five "Extra Targets" were "Destroyed". Since you get Gold Bolts for destroying these targets, you'll want to be able to readily identify if one has been destroyed or not. That's easy enough to do, since each enemy destroyed who is considered one of these targets of interest will give off a multicolored glow when obliterated.