In a sign of things becoming full circle, Microsoft decided to expand the franchise to other genres and commissioned a real-time strategy spin-off, Halo Wars, which was eventually released on the X-Box 360 in 2009. The series became a huge success, selling millions of copies of the original game and its sequels Halo 2 (2005) and Halo 3 (2007), and a spin-off, Halo 3: ODST (2009).
The Halo series began life as a real-time strategy game for Mac, before transitioning into a first-person shooter for PC before finally arriving on the original X-Box in 2001, the first shooter since GoldenEye to really work with a console controller.
