Your task in Fast Decode is to escape from a room with many doors. There is a limited time allotted for opening each door - this is a scale that decreases at the bottom. There may be several different types of locks on a door. Look for the keys and these can be cards or regular keys, but they must match the color of the locks, just like the cards. Click on the key and then on the lock on the door that matches it. Security will appear soon, which means you need to be careful, otherwise you will have to start from the first level in Fast Decode.
