Both versions are similar for me, although the SMS version has more slowdowns. It's a relatively easy game, both to pass the stages and bosses and to get the emeralds (of which you can get five during the adventure and one at the end). It has memorable music and charismatic sprites. The game's weak point is its gameplay, which is a bit harsh, especially underwater. Other than that, Sonic Chaos is short and playable, although very weak when compared to other Big Blue's games.