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From Diablo Wiki
PTR
,pre-release data
The Diablo 3 PTR first went online in September 2012 in order to test [[Patch 1.0.5]].
Unusually, for a developer, Blizzard also put unreleased games on the PTR. This may be to test pubic opinion on unreleased content not yet available for public testing without having to officially announce/confirm new additions and updates. The most recent titles to be released this way were Hearthstone and [[Reaper of Souls]].
