This 2011 platforming Port for the Nintendo 3DS merges two eras of high-speed action. You control both Classic and Modern Sonic, with Modern Sonic utilizing Boost, sliding, and Homing Attacks, plus a unique Stomp ability. The story involves time-distorting vortices pulling Sonic into a white dimension where he must restore the world alongside his past self. This version distinctly uses the 3DS depth effect and allows Modern Sonic to wall jump off any surface.
The gameplay experience is split between two distinct styles of the franchise's protagonist, reflecting different eras of the series. The "Modern" iteration features mechanics familiar to players of recent entries, including the Boost ability for rapid acceleration, the capacity to slide under obstacles, and the essential Homing Attack. A notable addition to this version's toolkit, learned after the second era of the game, is the Stomp maneuver.
A significant aspect of this specific port is its utilization of the Nintendo 3DS hardware. The level design actively incorporates the system's stereoscopic 3D effect to enhance depth perception, particularly when the player character jumps between the foreground and background elements of the stage. Furthermore, the ability to wall jump is expanded; unlike some other console iterations, the Modern character can execute wall jumps off any vertical surface, mirroring mechanics seen in other contemporary handheld titles.
The narrative begins in the familiar Green Hill zone with the Classic iteration of the hero. Following the completion of the first stage, a mysterious purple vortex appears in the sky, signaling an impending disruption. The story then shifts to the present day, where the Modern hero is preparing for a celebration with a friend, only to witness that friend being pulled into a similar vortex. Upon entering this strange, white-hued dimension, the Modern hero must work to restore the environment, eventually reuniting with the Classic counterpart who is believed to be a past version of the hero himself. This quest involves exploring environments reminiscent of nighttime cities and oversized natural features.
This specific release for the Nintendo 3DS does not feature any downloadable content (DLC) or expansions beyond the base game package. The game remains a fixed experience based on its 2011 launch state, focusing on the core platforming adventure.