A port of Sonic Generations
In the 3DS version of Sonic Generations, Modern Sonic's gameplay is similar to that of Sonic Rush and the DS version of Sonic Colors. He has the Boost, the ability to slide under obstacles, jump off walls, and the Homing Attack. After the second era, Modern Sonic learns the Stomp. Modern Sonic's levels use the 3D effect of depth on the 3DS version more actively as well as to giving a better view for when Modern Sonic jumps into the background, although the console versions are 3D-TV compatible. In the HD version, Modern Sonic is only able to wall jump off certain panels (similar to the DS version of Sonic Colors), but in the 3DS version, he is able to wall jump on any wall (much like Sonic Unleashed and the Wii version of Sonic Colors).
Also in series
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The level design is not nearly as good tho, and classic Sonic can use the homing attack for whatever reason. So the distinction between these two is barely present in this version of the game.
It's fine. If you can't play the actual Sonic Generations, it's not a terrible alternative.