I made the mistake of playing the 3rd one before the 2nd... however I like this one more in simplicity, and I like that hitting buttons doesn't drop your hit score.. I have arthritis and OCD, and sometimes find myself tapping keys on my other hand just to tone even the hands up. And I have to take breaks every now and then to pop my fingers from cramping on me.
I gotta say out of all the Classroom games, this one has always been my favorite... I remember when it first came up on Hallpass... my friend and I would play this game a ton when we had sleepovers.