Yahoo’s at it again.

The online giant has made another acquisition only days after reaching a deal to buy Tumblr. This time around, Yahoo is expanding in the gaming arena with the purchase of PlayerScale.

PlayerScale develops software for cross-plaform gaming that allows publishers and aggregators to quickly scale titles across various platforms. Founded in 2011, the company has over 150 million users worldwide, and it’s adding more than 400,000 new users every day.

PlayerScale CEO Jesper Jensen announced the merger Thursday on the company’s Web site, saying PlayerScale won’t be going anywhere and its gaming infrastructure platform will continue to support its existing products.

“Our goal has always been to help developers build the best possible games, without having to worry about building and scaling the infrastructure required to operate today’s biggest successes,” he said. “In working with the folks at Yahoo, it has become clear that we share this passion.”

Jensen noted that in the past four months alone, PlayerScale has increased its daily user growth rate by almost 60 percent. With Yahoo’s backing, it can release new products and improvements much faster, he said.

Yahoo, meanwhile, gave CNET the following statement: