Sonic the Hedgehog 4 Episode I/Episode II

Sonic the Hedgehog 4 is a universe that contains 1 character, 1 stage , and 6 trophies

Sonic
Sonic is a starter character in the New Super Smash Bros series

Green Hill Zone
Green Hill Zone is World 2 in New Super Smash Bros series

Sonic the Hedgehog 4 : Episode I
Sonic 4 was used for NSSB and NSSB Wii

Sonic the Hedgehog 4 : Episode II
Sonic 4 II will be used for NSSB 3D