Radical Highway is the fifth level in the Nintendo 3DS version of Sonic Generations, and an adaptation of the level Radical Highway seen in Sonic Adventure 2. This stage was a Shadow the Hedgehog stage in the original game, so this is the first time Sonic has actually traversed this stage, Classic or Modern. Modern runs through much like he did in Speed Highway with corkscrews and suspended highways, while Classic Sonic hops and bops his way along the highways, even heading up to the orange blimp that hovers over the stage.
Classic Sonic's Act sees the half-pint hedgehog roll under barrels, bounce over Gun Beetles, swing from bars and catch the "Got Ring?" blimp in time to bounce his way over a wall. Most of the level layout consists of straightaways and a large number of slopes that Sonic can gain speed quickly from by rolling down them.
||Clear Radical Highway Act 1 in 3:00.00 without losing a life!
||2000 Illustration (Art)
||Collect 30 Rings in Radical Highway Act 1 in 1:00.00!
||Live & Learn (Music)
||Keep the Pace
||Grab Time Items and clear Radical Highway Act 1 in time!
||Unknown from M.E. (Music)
||Defeat 11 enemies in Radical Highway Act 1 in 0:45.00!
||Throw It All Away (Music)
||Clear Radical Highway Act 1 in 3:30.00 without defeating enemies!
||2001 Illustration (Art)
||Defeat 3 Gold Beetles in Radical Highway Act 1 in 2:30.00!
Modern Sonic's Act sees the present-day hedgehog grinding across the suspension rails of bridges and dodging G.U.N. planes. The level is designed in a somewhat 3D environment where some routes are inbetween others, so depending on what Sonic does, he will end up in either the foreground grinding on the bridges, the middle going through the middle of the bridge, or going into the background to avoid a platforming section. There are also hidden rockets that Sonic can use to take shortcuts with.
||Clear Radical Highway Act 2 in 5:00.00 without taking damage!
||10th Anniversary Figurine (Art)
||Collect 75 Rings in Radical Highway Act 2 in 1:00.00!
||Toxic Caves (Music)
||Keep the Pace
||Grab Time Items and clear Radical Highway Act 2 in time!
||Palmtree Panic (Music)
||Defeat 15 enemies in Radical Highway Act 2 in 0:30.00!
||2002 Illustration (Art)
||Clear Radical Highway Act 2 in 0:40.00 without defeating enemies!
||Sonic Boom (Music)
||Get all Item Boxes in Radical Highway Act 2 in 1:30.00!
||2004 Illustration (Art)
||Boost through Radical Highway Act 2 in 5:00.00!