In 2023, it says I don't have flash 6. Right Click Forward did the trick for me.
for the game itself, it's an interesting concept for what boils down to a match 3 game, but falls short as it requires you to misplace some tiles at times which never feel good or fair. Take Tetris as a point of comparison - you can play an entire game of Tetris and only have a few blocks here and there that you have to misplace due to no available move. Even then, they're usually pretty easy to work around.
Here, with 3 columns to work in, you're essentially shutting out 1/3 of your play space when you are forced by the game to misplace a tile.