The rival battle against Shadow the Hedgehog in Sonic Generations (Nintendo 3DS) takes place in the elevated streets of Radical Highway.
Like the previous rival battle, its a race to the finish to beat Shadow in a 1-Act race. The race also takes place in an existing level in the game instead of using a totally new environment like the console fight. Similar to the portable game series Sonic Rivals, Sonic and Shadow can attack each other mid-race to slow each other down. Shadow can perform the Sonic Boost as well as Modern Sonic, so its crucial to keep your speed up and dodge obstacles quickly.