sonic games sorted by whether they exist in the half-life universe
this runs on the assumptions that a. the sonic the hedgehog franchise exists in the half-life universe and b. half-life 1 takes place starting on may 16, 2003
this runs on the assumptions that a. the sonic the hedgehog franchise exists in the half-life universe and b. half-life 1 takes place starting on may 16, 2003