Players must decipher a secret code composed of four symbols. Each attempt will cause the symbols to light up in different colors. Red means the symbol is not present at all in the original code. Yellow means it's in the wrong spot. Green means it's in the right spot. If players crack the code in seven tries or less, the game ends.
- A similar game could be played in PSA Mission 11: The Veggie Villain.
- This game is based off the Mastermind board game.
- It appeared in Field-Ops 1, 2, 6, 8, 9, 13, and 14.