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Battlefield Heroes is a Free-to-Play game, but with micro-transactions. You can spend money on Battlefunds, with which you can purchase different clothing for your heroes, or special guns or widgets to improve your performance on the battlefield. For those who don't want to spend money, you earn Valor Points as you play, which can be used to temporarily purchase some guns and widgets, and a select few articles of clothing.
Never played before? Try the game out for free at Free FPS - Free Shooter Game - Online shooter - Battlefield Heroes - Want special bonuses for yourself and I? Sign up with THIS link, and enjoy! (When you reach level 7 on any Hero, you receive a 1-Day XP Boost, and I receive 1350 Valor Points - If you buy 2800 or more Battlefunds within 60 days of registering, you receive 1000 Valor Points, and I receive 700 Battlefunds!)