Despite what some commentators - me included - think about card battling games, DeNA argues it's made Rage of Bahamut stick.

The English language version of Cygames' online card battler, which is published on DeNA's Mobage platform outside Japan, has now been installed over two million times.

Trumping

No doubt DeNA has spend big promoting the game in terms of user acquisition costs .

Nevertheless, its position in the US top grossing iPhone chart - peaking at #1, currently #3 - means it's found a fanbase prepared to lay down cash.

It's also been #1 over 14 consecutive weeks in the top grossing chart on US Google Play.

"Cygames is delighted to see US Mobage users enjoying Rage of Bahamut," said Koichi Watanabe, president and CEO of Cygames, Inc.

"We will continue to bring the best entertainment experiences that exceed the expectations of people around the world."