Cats are usually afraid of outside sounds and hide somewhere close then wait for a long time. First search your house, garden, garage and places that your cat can hide with some scented tuna and Cat Magnet:Find Missing Cats" app. The App is free and has attractive cat sounds for cats in different moods. Play all of the sounds while searching. One of them possibly attract your cat. If your cat is not close by search at night with powerful flashlight, some scented tuna with you and using Cat Magnet. Look for reflected eyes. This method worked for me and I hope it works for you too.