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The Cerebral Gateway is the final level of Serious Sam: Tormental, accessible only after collecting 32 Mental Keys.

Plot[]

Sam finally unlocked the gateway that the fragment of Mental was guarding. Time for Earth was running out quickly, as the Moon was quickly approaching the planet's surface, but if Sam knew one thing about himself it's that he is persistent. His real self was still out there somewhere in the physical realm, all he needed was a little more time. Mind Sam ran into the gateway in the hopes that attacking Mental's weakspot would delay the Moon long enough for his real self to figure out a way to save humanity.

What awaited him was a gargantuan horror, the source of all of Mental's horrific plans and ideas: the Mental Thought. As expected, slaying the monstrosity couldn't save the Earth and did not destroy Mental, but it did delay him long enough for the real Sam to enter the Time-Lock. Mental was furious, but incapable of doing anything about it he relented. Neither one of them could truly destroy the other now, so Mental and Sam came to an agreement. Mental would keep coming up with new monsters and traps to torment Sam, while Sam would keep destroying them and annoying him for all eternity.

Trivia[]

  • The Cerebral Gateway can be entered any time the player reaches the Vault once it has been opened, be it after defeating the Mental Institution or prior to starting a new run in the hub. It's important to note that if the Cerebral Gateway is entered during a run, it will always count as advancing to next loop (f.e. it will always be V2 at the first opportunity, V3 during the second loop and so forth).
  • The blue chest in the starting area will always contain the Ultra Serious Cannon, which cannot be obtained at any other point in the game.