Battle Network 4's new tournament style gameplay takes players on a succession of battles as Lan and Mega Man continue their quest to rid the net of viruses. An innovative new good/evil balance system tempts players by offering a dangerous "Dark Chip" as an easy way out of a pinch. If players resort to the "Dark Chip" too often they risk being consumed by evil and losing certain abilities. The two versions of Battle Network 4 feature a great amount of variety including separate storylines, unique enemy souls (six per game), new tools and battle strategies. Players will be able to link the two versions to trade programs and chips, as well as battle with one another or compare battle records.