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In Pet Rescue Saga you will get different obstacles in each level. These obstacle gives you extra challenge to complete the level.
As you play the levels, the levels get more difficult and different types of obstacles are introduced. Such as wooden planks, that can not be removed, locked marble stone blocks that you unlock by using a key block or Master Key Booster.
All levels with marble blocks have naturally occurring keys in them. You never need to buy a Master key Booster in order to pass.You use a key block by dropping it on something hard. It will free the key inside the transparent key box. When the key has no shells you can click on it and all currently visible marble blocks will be unlocked and disappear.
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