Enjoyable.
That was awesome. Unlike lots of other flash games I've played where it's just random clicking, this game actually has quite a bit of depth in it. It really stimulates the mind. And well I just loved it. I found the difficulty of this game just right. Due to the gradual progression of dificulty in each level, each level's not so hard that they're impossible to do while still presenting a nice challenge. Keep up the good work. I gave it a 5 cause it was fun and rewarding to beat.