Mega Man Battle Network 4: Red Sun is an action role-playing game released for the Game Boy Advance in 2003. It's part of the Mega Man Battle Network series, which combines elements of classic Mega Man action with strategic, card-based combat and a compelling storyline set in a networked world. Players control Lan and his digital avatar, MegaMan.EXE, as they combat viruses and other cyber threats in both the real and digital worlds, using 'Battle Chips' to execute various attacks and abilities in combat.