This is a US version of MegaMan Battle Network for the Game Boy Advance, designated as (U)(Venom). This version, like the other releases, is a departure from the original Mega Man formula, focusing on turn-based strategic combat using battle chips in a cyber world. Variations in ROMs may indicate changes to game graphics or minor adjustments to game mechanics compared to other releases.  The core gameplay, however, remains focused on tactical chip usage to overcome opponents. 

MegaMan Battle Network (U)(Venom)

Megaman Battle Chip Challenge (E)(Rising Sun)