What does R4 for the DS do?

R4 its like a pendrive, with him you can download DS roms from the internet and play on the DS,

By:Dan~* Djgreendj: The R4 is a special tool used to download DS games straight from the internet for free. Plus if you have the right software installed you can select cheats for your gameplay! Eg. you download Pokemon Platinum from the net and you can select cheat codes like Unlimited Master Balls or Exp Multiplied by 100. But a Word of warning if you select to many cheat codes your game will stuff up.