Just an idea, if you're bored and what something challenging out of the game, try playing along these rules :
Hud display hints - Off
Hud display - Off (0%)
Not allowed to look at the map at all, you might as well avoid map consoles and forget about the Z button
No music (well you can turn it on, but I'd suggest keeping it off)
50% Energy Tanks or less
Either difficulty
If you're wondering how to tell when you're low on missiles, it should give a high pitched tone/beep when you get within a certain, low percentile.