The final two levels in this are complete bullshit, especially the final one. Having to fight two bosses all the while having no rings is completely stressful, and the game doesn't prepare you for this at all. I don't know if I could've beaten this if I didn't play this mobile. The rest of the game was pretty fun, though. Imaginative stages just like the first Sonic game. The inclusion of Tails was neat, too. Too bad he was excluded from the final boss fights.