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Joining AW-NET for NeoGeo Battle Coliseum
NeoGeo Battle Coliseum Master Guide, page 4
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Buy an AW card, play NeoGeo Battle Coliseum with it, then register on a supported phone with the code on the back. ¥315 a month including tax. You join by phone first, then log in on the PC. The page shows the card designs, the phone menu routes, the PC channels and a phone screen of character usage.