Puzzle 1: Breaking the Lock

You’ve reached a locked door. The keypad has power issues. You have one shot to enter the correct 3-digit code.
Clues:
1) The code is between 100 and 999.
2) The sum of the digits is 9.
3) The digits are in strictly ascending order (e.g., 1 < 2 < 3).

Puzzle 2: Atbash Decryption

You found a classified message. Decrypt it using the Atbash cipher (A ↔ Z, B ↔ Y, C ↔ X, etc.):

"Dvoxlnv gl gsv zxzwvnb Ifwb"

Type your decrypted solution below. Don’t worry about punctuation or uppercase.

Puzzle 3: Cutting the Right Wire

To disable the security system, you must cut one of four wires:
Red, Blue, Green, Yellow
A label on the device reads: RBG Security, and rumor says they always “short out” the color in the middle of their brand name.