You need to complete the first 25 levels, and then you must spend the 25 stars you earned on upgrading the animal areas. Once you can do that you can replay levels 1 thru 25.
When you enter the game you will click on the arrow in the circle, to the left of the level you are up to. You will get a large pop up that says level collection. You pick what level you wish to do, and start playing.
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