Casual action game Hills of Steel has surpassed 10 million downloads across iOS and Android.

Developed by Helsinki studio Superplus games, Hills of Steel tasks players with taking control of a tank and mowing down hordes of incoming enemies.

The game also features unlockable tanks and a multiplayer feature so players can face off.

Hills of Steel’s publisher Round Zero was formed by Finland-based Hill Climb Racing dev Fingersoft last year. The company is designed to function as the company’s game evaluation and publishing label.

“Round Zero’s process benefits game developers whether or not they actually want to pursue a publishing deal with us. In the end, games developers still get free new users for their game,” said Round Zero CEO Daniel Rantala.

“Finding such a game as Hills of Steel so early on was a great way of verifying the functionality of our newly-crafted publishing model.”

Tanking it

Plans are already afoot for a sequel with the aim to capitalize on the success of the first hit title.

“We see lots of potential in Round Zero’s publishing model,” said said says Superplus CEO Kalle Mäkinen.

“It is fair for all the parties – the decision to publish a game, and the ability to scale up its user base, is based entirely on data and not on anyone’s subjective opinion.

“I’d go as far as to say that our cooperation with Round Zero is like a well-managed marriage; both parties complete each other ensuring the whole is greater than the sum of its parts.”