Cheats, Codes & FAQs
Save Your Stars
When you get stars don't use all your stars on anything other than guns, endurance, leadership, etc. Don't use your stars on ammo or health.
So what you do is you get a gun (with four stars) and if is the wrong gun don't get to the end of the level. Get back to the star page and press Square to undo the stars from your recent purchase (you cant finish level, if you do then you cant get back stars).