Boofie's Bunker

Boofie's Bunker is the first location you will encounter in the game. The only enemy present is Boofie. In Easy mode, Boofie first spawns after the first door is unlocked.

In Normal, Hard, Extreme, Ultimate, and Impossible, Boofie is always there, patrolling from the very moment you step foot into the bunker. In Hard and Extreme, more Boofie's spawn as more doors open. On Impossible, for every door you open, another Boofie joins the hunt. There are vents scattered around the bunker, and Boofie begins using them in Normal difficulty and up. The upper level is far more safer than the basement level. This is because the vents are closer to each other and Boofie patrols more of the basement.

On Hard mode, the more doors you open, the dimmer the lights get. On Extreme, Ultimate, and Impossible, the bunker lights are always very dim. This can make it difficult to locate the Black Key, which is introduced in Hard mode.

On Impossible mode, there are five Boofie Plushies scattered around the map, randomized every time the map is entered. If you are holding the plush, it will let you cheat death if you collide with Boofie, which is very useful in the basement because Boofie WILL find you in there. Impossible mode will also reveal some surprises that will not be mentioned.

At the bunker, you are required to find all the keys to open all the doors. Each key matches the sound and color of the keyhole on the door. The amount of keys depends on the difficulty:
 * Easy - 4
 * Normal - 6
 * Hard, Extreme, Ultimate, Impossible - 8

On Ultimate mode, you don't have to bring all the keys back to the door, because all the doors are already opened. However, you still must collect the keys, because if you leave without all of the keys or be caught by Boofie, Boofie will come out and hunt you down within Zelion's prison. There are also four Boofie's patrolling the map, and no Boofie Plushies are around to save you. There is a purple and white square on each level of the bunker on Ultimate. Interacting with this will take you back to Zelion's prison, but be sure you have all the keys first (you will know when you have them all when you hear an eerie sound).

You are also supposed to search carefully for secrets to unlock the other gamemodes. Remember, you must complete all of the gamemodes to progress onto Ultimate and Chaos Modes. It is recommended that you look for these things in the Easy bunker before you unlock the first door, because if you don't, it will make things harder because Boofie will be patrolling the halls of the bunker.
 * To unlock Boofie's Hedge Maze, you must beat your first bunker level.
 * To unlock Boofie's Kitchen, you must go through a wall that stands out and makes a strange sound in the kitchen section of the bunker (to the left of the stairs if you are facing the library, which is in the very back).
 * To unlock the Arcade, you must interact with the arcade machine inside the bedroom (to the right of the stairs if you are facing the library).
 * To unlock the Backrooms, you must go through a wall that does not stand out in the basement near the stairs going down. To get out of the Backrooms under the bunker, you must search for a giant vent that should not be hard to find. You will come out right next to the arcade machine no matter which vent you go through.

There are 4 trophies you can unlock upon completing bunker levels, and 3 secret trophies (not including Lu) that you can find and unlock: Normal Trophies:
 * Boofie Trophy (Easy)
 * Skull Trophy (Normal)
 * Smiley Skull Trophy (Hard)
 * Bloody Skull Trophy (Extreme)

Secret Trophies:
 * Dave Microwave Games Trophy
 * Padre Snowmizzle Trophy
 * PhuCat Trophy