If you're playing Mark of the Ninja on Mavericks OS X 10.9.1 (or higher) and you experience launch issues, here are steps you can take to get around the OpenGL issue and should allow you to play Mark of the Ninja on your system.
- On your Steam games library, right-click on Mark of the Ninja and choose "Properties";
- On the "Properties" window, click on the "BETAS" tab, enter the code M@rkTh3N1nj@, and click on "Check Code" This will add the Alpha build that you can opt into (which has the fix for your game);
- Click on the dropdown box and choose the "Alpha" build;
- Playing on Alpha build should allow you to launch Mark of the Ninja on Mavericks OS X.