2 Tips for Level 48: 1)If you have trouble tapping both RED circles at the same time, you can tap and hold 1 and tap the other one (whilst holding thing first circle). 2)Don’t focus on what circles are already RED, instead focus on the BLACK circles, that way you can see which BLACK circles are no longer BLACK.
The game isn’t that difficult. Most levels are easy, some are moderate, and a couple can be hard.
If you don’t like the music, you can turn it off in the in-game settings.
I did have to use hints on some levels, however, unlike most games, they are free.
I beat it in ~15-20 minutes.
A RESET LEVEL button would be nice to have, instead of quitting and resuming.
My only “complaint” is no Game Center achievement for winning, otherwise I liked it.