 Originally the plan was for only 100 weapons to feature, but as the team became familiar with the Wii hardware, the number tripled.In 2009, a year before the planned release, Nintendo asked Sandlot to include co-op—which the team had never tried before—then control options for the Classic Controller and the Wii MotionPlus.These additional elements put a lot of strain on the team, with Yamagami describing it as a "dark year" for the team.