10 Secret Areas That Exist In Your Favourite Video Games

4. Call Of Duty 4: Modern Warfare - Mile High Club

Call Of Duty 4 Mile High Club
Activision

This bonus level was only playable by those who managed to complete Call of Duty 4: Modern Warfare's single-player mode, then watched the credits to the end. Despite being very short, it also proved to be one of the best levels in an already great campaign.

The Mile High Club takes place aboard the constraints of a hijacked double-decked aircraft. As such, it's extremely close-quarters, and very easy to get killed on higher difficulties. The player has to rescue a bunch of hostages, defeat the hijackers, and get out of there. A fan favourite for making speed runs, the Mile High Club is one of the most challenging but fun secret FPS levels out there.

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Tom Butler hasn't written a bio just yet, but if they had... it would appear here.