Mega Man Battle Network 4, known as Rockman EXE4​ (ロックマンエグゼ４ Rokkuman Eguze Fō) or Rockman EXE 4 in Japan, is the fourth game of the Mega Man Battle Network series, released for Game Boy Advance in 2003 with two different versions: Red Sun and Blue Moon, known as Tournament Red Sun (トーナメント レッドサン Tōnamento Reddo San) and Tournament Blue Moon (トーナメント ブルームーン Tōnamento Burū Mūn) in Japan. In this game, Lan Hikari and MegaMan partake in a series of NetBattle tournaments. A sequel, Mega Man Battle Network 5, was released in the following year.