Mega Man Battle Network 4: Blue Moon Game Boy Advance

Two versions of the game are available: Mega Man Battle Network 4: Red Sun and Mega Man Battle Network 4: Blue Moon. Both versions set themselves apart from previous games in the Battle Network series by focusing on the tournament system used. By defeating cyber enemies, players may eventually find themselves in their version's final tournament, Red Sun or Blue Moon.

Two new features are available in this fourth installment, the "Soul Unison" system and the "Dark Soul" system. The "Soul Unison" system allows players to "synch up" with the souls of previously defeated opponents, to use their special abilities while fighting new opponents in the tournament.

When players find themselves in a bind, a "Dark Chip" may appear, tempting them with an easy solution. However, when these chips are used, Lan's NetNavi (the program on his Personal Terminal that allows him to become Mega Man.EXE in the virtual world) is affected and consequences, such as the inability to perform "Soul Unisons," will occur. The more often Dark Chips are accepted, the more drastic the potential negative effects.

Other features of this fourth installment include the ability to expand the story line of each versio,n by linking with a friend via the Game Link cable for the GBA. In doing so, players will be able to trade programs, chips, and NetNavis, or battle with other players of either the Red Sun or Blue Moon versions. ~ Damian Francis, All Game Guide