Sonic Dash Fullscreen Reversed Color Gameplay HD (Shadow the Hedgehog)
In the past, Shadow has had a degree of mental instability, in particular post traumatic stress disorder. This was demonstrated by his instances of post-traumatic flashbacks to Maria’s face prior to and during the events of Shadow the Hedgehog, though it could be argued that the instances of the latter game were simply an effect of his amnesia. On one occasion, in Sonic Adventure 2, seeing police sirens flashing caused him to intensely flash back to the massacre aboard ARK and in particular Maria’s death. Shadow was soon able to overcome this in his his own game and in Sonic Battle when he chose to move on from the past, yet keep Maria in his heart.