This is a fairly straightforward achievement to get, just a little bit time consuming. I had to complete 75 levels before I unlocked the achievement, which took me about 7/8 hours. There is normally about somewhere between 0-3 doors on each level. You can check your progress towards this achievement through the statistics on the right hand side of the main page. Keys can only be used in the level you find them in.
In adventure mode you need to find the hidden keys lying around the levels and then take them to open any of the wooden doors. You need to open a total of 100 doors across all your games. Quick note: This is a cumulative achievement and does not need to be done in one game.
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