Mega Man Battle Network 4, known as Rockman EXE 4 (ロックマンエグゼ4, Rokkuman Eguze Fō) in Japan, is a video game developed by Capcom for the Game Boy Advance (GBA) handheld game console. It is the fourth game in the Mega Man Battle Network series. Like Battle Network 3 before it, Battle Network 4 has two different versions, Red Sun (Tournament Red Sun in Japan) and Blue Moon (Tournament Blue Moon in Japan), that differ in story and gameplay details.