DeNA will pay $300m initially and up to another $100m in performance fees by the end of next year to buy Google-backed Ngmoco.

Japan-based social gaming group DeNA has agreed to buy Google-backed Ngmoco, which makes games for electronics group Apple’s iPhone, for up to $400m in cash and shares.

DeNA will pay $300m initially and up to another $100m in performance fees by the end of next year. DeNA said it would integrate its Mobage software with Ngmoco’s social networking platform Plus+, which runs Apple’s mobile operating system as well as smartphones powered by Google’s Android.

In August, Google Ventures, the…