As players progress in Warzone, they receive items through the Battle Pass System, a tier-based reward system. Over a fifth of the 100 Tiers of content that you must earn are available for free to all gamers. You can access Tier 0, a collection of special items for Battle Pass owners, along with all 100 Tiers by purchasing the entire Battle Pass. Typically, Tier 0 includes a Watch or other aesthetic item, a new Operator, a new skin for an existing Operator, several Operator Missions to open up new content, and a global 10% XP bonus.