Continue the cyber-adventure with Mega Man Battle Network 4 Blue Moon for the GameBoy Advance. Lan Hikari and MegaMan.EXE return to compete in a series of NetBattle tournaments while uncovering a new dark threat. This installment introduces the Double Soul system, allowing MegaMan.EXE to fuse with other NetNavis for powerful new abilities. Collect Battle Chips, master new strategies, and navigate the evolving digital world.