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I found the Lucky Dip a bit confusing @justmomie If you haven't got any of your own Lollipop Hammers when the Dip is active then the Lucky Dip won't work. Also if you do have Lollipops available then the Lucky Dip isn't active all of the time. You can only use the Lucky Dip when the Lucky Dip icon is showing, but only if you have a Lollipop to use.
And yes, sometimes the Lucky Dip icon flashes, but you don't need to use a Lollipop at that moment.