Dead Rising: Case Zero, the paid-for prequel to Dead Rising 2 - which Capcom released in place of a free demo - has sold well over 300,000 copies globally in its first week, according to public leaderboards.
The title, which is available exclusively on Xbox Live Arcade for 400 Microsoft Points ($5/£3.40/€4.80), has over 328,290 different scores registered on its leaderboard, a figure which indicates a significant level of success to what was essentially something of an experiment.
Digital download specialist site Gamerbytes reports that, if Microsoft has taken its usual 30 per cent take of the revenue, Capcom will have generated somewhere in the region of $1.1 million from sales of the game in the first week. It's thought that the success of Case Zero could trigger a wave of paid-for demos across XLBA and PSN.
Earlier this month, Capcom's head of global research and development Keiji Inafune told sister site Eurogamer that he wanted Dead Rising to supersede Resident Evil in terms of success.
"The goal for Dead Rising 2 is to replace the Resident Evil franchise and become the number one IP within Capcom," he said.
The game has yet to be released in Japan, where it was delayed from an original release date of 31 August, reportedly because of its violent content.