My first game ended with a score of 980; I wasn't playing carefully. My second game is at 48,000, and counting. This game just won't end, even though I want it to. Can I catch the fellow with 69,000? Do I care? He's still adding to his score. I've spent way too much time on this and have neglected more serious, better puzzles.
To make this game better, the grid must be shrunk. Or add a 4th color. Or not allow pieces have less than 3 squares.
At the moment, there are over 24,000 players and I'm #9 on the leaderboard.
5+ (fiveplus) is popular because of 2 things: good graphics and easiness.