Sonic the Hedgehog 2 is a 2D platformer for android that is a completely rebuilt release for Android and other HD platforms. It costs $2.99 and has zero in app purchases.
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Pros
Pro Hidden Palace Zone
The developers reconstructed Hidden Palace Zone - an area previously unfinished and only available in early betas of the original console game - specifically for this release.
Pro Built by prominent members of the Sonic reverse engineering community
The developers, Stealth and Taxman are not just passionate fans of the franchise, but prominent members of the reverse engineering community surrounding it. In particular, Taxman is known for having built a very accurate remake of the classic Sonic engine, and Stealth is known for building a wide range of tools and hacks, as well as building a better port of Sonic for the Gameboy Advance, with no access to the original source code.
Pro Classic platforming gameplay
Sonic the hedgehog 2 still offers on of the best plaformer gameplay experiences ever made.
Pro Has online real time multiplayer
Players can compete in online multiplayer races with their friends where they are tasked with being the first to get to the end of a chosen level.
Pro MOGA controller support
Sonic the Hedgehog 2 has built in MOGA controllers support.
Cons
Con Touch screen controls not as accurate as using a controller.
While the touch screen controls are good compared to other games they are still not as accurate as using a controller.