OK, so there IS a bug in this game. 
Comment posted by Tony this morning:
Fun, managed to end up with two tiles that didn’t match though….
The moment I read this, I immediately know what went wrong: he’s typing too fast! (well, not his fault though). Here’s more details: when you tapped on two identical tiles, the system spent 0.3 seconds drawing a connecting path between them. Now if you have a fast finger, you can break it within that 0.3 seconds.
The bullet-proof solution to this would be freezing the board while drawing the path. But this introduced some computation overhead. Instead, I simply reduce the drawing time from 0.3 second to 0.01, and still able to see the flash of a connecting line on screen. Bingo! The bug fix was launched!
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