The Perils of Pweepwee

"The Perils of Pweepwee" is a game for the Grintendo System that once belonged to Greg Universe. It houses a corrupted gem that can magically bring the game's enemies to life.

Appearance
It is a gray game cartridge that is rectangular in shape. It has a yellow gemstone embedded on its surface.

Gameplay
You play as the character Pweepwee, a blue creature that battles enemies known as Sudsies. Sudsies constantly respawn until the player cuts the power to their base.

Steven Universe: Greg Universe Special
Steven brought his dad a box of things including Greg's old Grintendo game system. Greg started to play The Perils of Pweepwee, but Steven couldn't play since he was grounded from television so Greg let him leave with the instruction booklet. Outside of It's A Wash, Steven encountered the Sudsies that suddenly popped into existence. He followed the instruction booklet to defeat them, which he accomplished by cutting the power to the car wash. With Greg distracted by the outage, Steven was able to sneak back in and get a look at the game cartridge. He found a corrupted gem embedded on it and bubbled it.

Trivia

 * The cartridge resembles a Nintendo Entertainment System Game Pak.