Rebellion is rather pleased, and it has every reason to be: its Sniper Elite series has sold over 10 million units since debuting in 2005.

The latest release in the third-person tactical-shooter franchise, Sniper Elite 3, was released last year and has received numerous content updates.

“Whether you’ve bought one or whether you’ve bought all of our Sniper products, thank you very much for supporting indie development in the UK,” said Rebellion CEO and Co-founder Jason Kingsley. “It’s been a pleasure to deliver great games for you and hopefully we’ll go on to do more in the future.”

To commemorate the milestone, sales on the game will be running across platforms throughout the month, including this week’s Steam sale which discounts the the trilogy by 81%. The original game is on sale for 90% off.