Until April 25th, players will get Heart of the Swarm for free when they purchase Legacy of the Void. The offer features a special gift if you already own the copy of Heart of the Swarm. The gift is a game key for another copy of Heart of the Swarm. It can be shared with friends. And it should be sent to your e-mail until April 28th, 2016. For more info check this official news.
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