Mega Man and Battle Network pal, Lan, are in trouble again. It's only been a month since the evil WWW terrorist's attempts to hijack an important military satellite was shut down. And, yet, Cyberspace is about to be hit by an even more resilient, never-seen-before-now virus, code-named "Zero". Collect battle chips, battle enemies, solve puzzles, and uncover secret characters from the Mega Man universe. It's up to you, Lan, and Mega Man to terminate this seemingly impermeable and decidedly relentless new enemy.