カードe
"Real Operation" is also compatible with the Nintendo e-Reader, which allows for the unlocking of certain Navis, some of which are required to complete the game. Navis also give unique features and mini-games to the player, such as NumberMan who will help the player study math problems. Each Navi has different personality traits to alter the playing experience as they speak and interact with the player. The game also features a real-time system and on certain days of the week, tournaments will be held in-game that the player can compete in, or you can set reminders on calendars that your Navi will keep track of. Darkloid versions of Navis that appeared in "Mega Man Battle Network 4" (such as TopMan) also appear in cyberspace for the player to battle against.