Summary:
- The article reports that Sonic X: Shadow Generations, a crossover game featuring Sonic the Hedgehog and Shadow the Hedgehog, has reportedly sold 1.5 million units worldwide.
- The game was released in 2011 and is a spin-off of the main Sonic the Hedgehog franchise, combining elements from both Sonic X and Sonic Generations.
- The strong sales numbers indicate the continued popularity of the Sonic the Hedgehog series and the appeal of crossover games featuring multiple iconic characters from the franchise.