Heroic difficulty has traditionally been the standard for Halo campaigns, at least on the development side. In other words, that difficulty level is designed first, and others are scaled down or up from there. That’s changed for Infinite.
343 Industries character director Stephen Dyck explained the reason for this in an interview with VGC. “Usually we look at Heroic,” Dyck said. “We’re tuning everything here; everything is scaled down a little bit for Normal and Easy and then scaled up a little
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