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Rockman.EXE 4.5 is a spin-off of the Mega Man Battle Network (Franchise) series. It is a simulation game where NetNavis are controlled by the AI, with the players "slotting-in" BattleChips and issuing commands. It was made to be used with the BattleChip toys and BattleChip Gate accessory, which was almost certainly the cause of the title's Japan-exclusivity. The accessories are not required, but without them the game becomes much more difficult.
The game features MegaMan.EXE, the twelve Navis that contribute DoubleSouls in Mega Man Battle Network 4 (Game), and other miscellaneous Navis. Several of the Navis in the latter category would later become playable in Battle Network 5 and 6. On the PET screen, the background music is a remix of the chosen Navi's Classic series stage theme (if applicable).
Available at the start:
Can be unlocked from normal gameplay:
Requires Battle Chip Gate with proper NaviChip: