<Tr> <Th> Aggregator </Th> <Th> Score </Th> </Tr> <Tr> <Td> GameRankings </Td> <Td> (iOS) 75.00% </Td> </Tr> <Tr> <Td> Metacritic </Td> <Td> (iOS) 76 / 100 </Td> </Tr> <P> Marvel: Contest of Champions has received generally positive response . Upon release in December 2014, the game was named Editors' Choice on the App Store . As of 2015, It had more than 40 million downloads . </P>

How many champions are in contest of champions