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There are currently four Diablo 4 World Tiers available, but you'll only have two of them available to you when starting out, as the other two must be unlocked much later - although a Diablo 4 dataminer uncovered evidence of World Tier 5 within the code, suggesting that an even harder option could be added in the future. Your initial World Tier choice will be between Adventurer (World Tier 1) and Veteran (World Tier 2), depending on how much previous experience you have with the Diablo series and whether you want to be challenged. The full rundown of World Tiers in Diablo 4 is as follows:

World Tier 1 - AdventurerAvailable from the start as the default World TierFor Levels 1-50Enemies are easy to defeat.Good for players that are new to Diablo, want to get through the story reasonably quickly, or just want a light challenge.World Tier 2 - VeteranAvailable from cheap Diablo IV gold the startFor Levels 1-50Enemies are more challenging and monsters provide 20% more Experience and 15% more Gold.