Natural Selection 2, Unknown Worlds' real-time strategy first-person PC shooter, sold 144,000 copies in its first week, grossing more than $1 million, reports Eurogamer.

The company released an infographic breaking down seven-day sales from Oct. 31 to Nov. 7. Copies sold include pre-orders, gifts and launch sales. Following release, Natural Selection 2 has amassed a peak of 7,135 concurrent players with more than 75 thousand matches played.

Unknown Worlds will begin the first-ever Natural Selection 2 large-scale competitive event Nov. 10. The matches, which will determine the European champion, will stream live via TwitchTV at 2 p.m. ET.

As reported previously, Natural Selection 2 was initially troubled with money problems and little manpower. After recruiting several fans, the game regained its feet and launched a day early via Steam on Oct. 30.