Twitch channel theohs_ has been streaming Hearthstone: Heroes of Warcraft the most in 2017 having streamed in 3436 hours so far with 692 average viewers and 692 highest concurrent viewers.
theohs_ also streamed the game Hearthstone second most in 2017 for 329 hours and had 581 average viewers while playing it. theohs_
also had 581 highest concurrent viewers playing Hearthstone.
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