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If you are getting stuck so early on in the game I suspect it's because King have made these levels harder. They change the algorithm determining at which point you get at "lucky board" every now an then by controlling which candies drop from the top. So your game might be different to what you can see on YouTube. You need to try to get combos of striped candies and colour bombs, wrapped candies and striped candies if you can. I have also found that if you close the game and reopen it, as opposed to keep pressing the "retry" button, sometimes they give you an easier board at the early levels, but I am not sure if this still applies for 449.