The secret of success of the Halo franchise

According to Frank O'Connor from Microsoft ... What may be the only true secret of success of the Halo series we can not know. But he tried to give us a hand in this Frank O'Connor, franchise development director for Microsoft, according to which the product developed by Bungie has proposed a sandbox by winning character enriched weapons, vehicles and AI together with a special emphasis fascinating story and a great multiplayer.

There seems little in fact. Source: CVG

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