player can select up to five Battle Chips, which are provided from a folder of player-selected chips. Ten random chips are available when the bar is full; a total of twenty can be used for each level excursion. Battle Chips are used for dealing large amounts of damage to enemies, protecting and restoring the player's health, summoning other Navi's to MegaMan's aid, and for some platforming abilities. Certain chips can even be combined to be more effective. Although Battle Chips are limited in quantity, they can be picked up from deleted enemies or can be purchased at shops when not exploring the internet. As in previous Battle Network games, items that upgrade MegaMan's maximum health, firing power, and other attributes can also be accessed. Development Mega Man Network Transmission was developed by Arika, who had previously worked on the Street Fighter EX series, a 3D polygon rendition of publisher Capcom's traditionally 2D fighting series. Producer Keiji Inafune revealed in an interview with Dengeki that after a string of PlayStation releases, the team chose to focus their development efforts of the Mega Man franchise for Nintendo consoles with the Battle Network series. They felt that children who played the GBA handheld were beginning to show interest in the GameCube, and that the character was more suitable to a console related to the Nintendo Family Computer, where the franchise originated. Inafune stated that the developer wanted to "preserve the core of Rockman" by transcending the traditional action elements (i.e. running and jumping) for the current gaming hardware from the perspective of the role-playing series. Network Transmission uses a cel-shaded animation style to match the MegaMan NT Warrior anime series that was airing in Japan during the game's development. Inafune explained that the team opted for an anime style with "eye-catching effects" in place of a more realistic look because he felt it the former would be more enjoyable. Yuji Ishihara, the primary character artist for the Battle Network series, used many of his previous character designs for Network Transmission. One new contribution was updating his illustration for the revived Life Virus by giving it two fists per arm, among other details. "I thought it would be both an effective look," Ishihara elaborated, "as well as make for a reasonably mobile character for a polygon-based action game." The musical score for Network Transmission was co-composed by Shinji Hosoe, Ayako Saso, and Yousuke Yasui.