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Activision Blizzard will shut down the first Call of Duty: Warzone on September 21.
The free-to-play battle royale was originally launched in 2020. Following the launch of Warzone 2.0, the original was renamed Warzone Caldera.
source https://www.gamesindustry.biz/activision-to-sunset-the-original-call-of-duty-warzone