Game Theory

Destroy four acid dispersers and enter the next room.

So many years... I've been alone for so many years! But now I have you, haha!
I have developed a game theory. It is brilliant, I swear! It says, I always win, haha! You are given the honor to prove this theory on practice.
According to my supposition, a white mouse can count to five. But you are not mice, so I hope you can count at least to four. If you can't, then it's your problem!

The screen is empty and silent.

Excellent! You are smarter than rats, but still not smart enough for me! I have comprehended the meaning of what those pathetic worms called the Object, haha!