The game is basically what those who have spent a few years in the video game wold would know: a frenzied two-dimensional platform game where you have to go through a series of levels at full speed while collecting all of the rings that you can. Of course, you also have to watch out for monsters, but the majority of them aren't a big problem if you go fast enough.
This version of the game, which is still in the "alpha" phase, includes the first world of the game, so you can only go up against the first big boss and the entire adventure will only take a few minutes.
The short duration, fortunately, is made up for with spectacular graphics that will leave you in wide-eyed wonder. SEGA's blue hedgehog has never looked as good as he does in Sonic 2 HD, where his movements as well as his modelling are truly exquisite. The rest of the game: enemies, rings, scenarios... also, they are meticulously made with fantastic detail.
Sonic 2 HD is a very fun game with outstanding graphics. And the best part of all is that it barely takes up any disk space, doesn't need to be installed and is perfectly optimized.