It took a week to hit one million downloads, while the second million was spread over two months.

Keeping up its momentum however, KartRider Rush Nexon Mobile's iOS port of KartRider, its massively popular online PC game, has now breached the three million barrier.

Released in March, the company is continuing to push the free-to-play game with support for the Korean language, plus new content, including new track Saharan Sands, Chinese-themed character ChenChen, and the Chiwoo kart.

More of everything

In addition, Nexon Mobile is offering its first six content bundles in a single 99c package, from July 21 to July 31. This features 12 tracks, eight characters and six karts.

"We are excited about the tremendous reaction we've received from players all over the world," said JeongMin Han, Nexon Mobile's team leader.

"We will continue to work and develop new  content for our players, giving them more challenges and fun."