The most successful is The Witcher 3: Wild Hunt. This episode accounted for more than 50 million copies. Such a number is a sign of its all-time worldwide success, as only the famous hit games Mario Kart 8 Deluxe and Red Dead Redemption 2 are ahead of this, selling over 3.53 million copies.
According to critics of The Verge, development studio CD Projekt RED will not only consolidate the success, but also increase the number of copies sold in the future.
Source: Ferra

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