Gram Game's latest puzzle title Six! has achieved two million downloads in its first week of release.
The iOS game also topped the free download charts on the US App Store, a first for the Istanbul-based developer.
It surpassed one million downloads within its first four days of release and went on to clear two million two days later.
Six! is due to be released on Android devices in the next few weeks.
"We are proud to have achieved this figure so quickly and reached that number one spot on iOS in the US, the team is excited to see what new heights we can achieve when it is also available for Android," said Gram Games' CEO, Mehmet Ecevit.
"In the end, however, we like to think that as a team, we have simply managed to put a smile on the faces of two million people in just a week. That makes us smile, too."
The studio has also recently opened a new office in London, and is exploring the possibility of midcore games further down the line.