5 stars: This was my most favorite game in the PC. Like a very long time ago, I had so much fun playing this with my cousins, and friends on the PC in 2005. But then after waiting for so long, I saw this game on the mobile and didn't really expect it to be as similar on the PC version. It really has the flaws of a music game, and over all it's so addicting. This is why I also like the old - school music games because they bring such great memories back to the day when you first started playing it lol. I still can't wait for new songs to play. They are so awesome and really cool to play. Great job on making such an awesome music game. :)
4 stars: Finally it come back with mobile phone. Last time I played was 8 years ago which only available on PC only. The game is nice to play, I very love it. But the thing is mostly the songs are Japanese Anime songs. If can come out with English or Chinese or classical orchestra songs, I think it will get more attention from the market.
3 stars: I can't open O2jam today. It suddenly forced closed. O2jam back to live on Android! That's a good news! However, you now need points (dollar) to play the flagship songs: Canon, Bach series, V3, Electro Fantasy, etc. If you don't want to pay (like me), you have to wait a few hours to refill your points. So, I rarely play this now. Some other free games are bound to be more generous than this. Oh yeah, almost forgot, where's the multiplayer, devs?
4 stars: Nice gameplay...it is enjoying but...