Through an incredible show of will, stabbing people and resetting saves, you've finally managed to infiltrate an enemy's secret base--and you best keep trucking, because it's not gonna get any easier.
They can be giant multi-floor complexes buried underground, hidden bunkers, space stations or collapsing buildings, and the only limit is the developers’ imaginations. What makes the secret base level stand out is that the enemy is there, searching you out, and it's going to take all your wits and skills to get to them first. Generally the secret base serves as a late-stage test of the protagonist's skills, utilizing everything they've learned to navigate tough puzzles, beat some of the baddest mooks the game has to offer, or both. While the secret base isn't always the location of the final battle, a major conflict usually comes to a head here, with the protagonist resolving a major side plot or defeating a false antagonist. Just hope that when it’s time to book it out of there, the self-destruct counter doesn’t start too low.