The mark of a truly great secret is when only an exclusive few are in on it. There are so many, in fact, that it’s a near-impossible task to pick just five to highlight, so go ahead and share your own favorites in the comments! 1. From Easter eggs and hidden collectibles to entire levels to uncover, each game serves up a hefty helping of rewards for those who venture off the beaten path. The DOOM franchise is positively bursting with secrets.
