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Today, Blizzard announced its intent to sue Lilith Games, the developers of mobile game Soul Clash, which is known in Taiwan as DOTA Legend, for "violation of copyright laws and trademark laws." This news comes from a press release on Blizzard's official Taiwanese site (and was examined by Gamasutra using Google Translate.)
At the same time, Lilith Games has taken aim at uCool, developers of Heroes Charge. It alleges that Heroes Charge is a clone of Soul Clash, and has filed suit in the U.S.
"Heroes Charge is so identical to Soul Clash in the rules, the character set, and even the user interface that we assume it could have been created by decompiling the source code of our original game," said Xinwen Wang, CEO of Lilith Games, in a statement.
For its part, Heroes Charge has been a big success for uCool, and even spawned an expensive Superbowl ad this year (at a cost of $2.25 million.) As of this writing, it's the number 17 top grossing iOS app overall in the U.S. charts.