Ten days on sale, and Touchgrind BMX has notched up 100,000 downloads on the App Store, pushing the series as a whole past the 1.5 million mark.

That's according to numbers released by Swedish developer Illusion Labs, which claims the game is selling at a faster rate than its predecessor, Touchgrind.

In fact, it's the firm's fastest selling game to date.

No illusion

"We are very proud of what we have accomplished with Touchgrind BMX," said CEO Carl Loodberg.

"It reinforces our belief that iPhone, iPod touch and iPad appreciate innovation and mobile gaming, and we plan to continue to push the envelop when it comes to multi touch control games."

As a result of the success of the series, Illusion Labs has announced the original Touchgrind will launch on the Mac App Store for free from July, utilising multi-touch technology provided by the Magic Trackpad and all MacBooks.