Overview
Aaahh!!! Real Monsters is an action-adventure platform game developed by Realtime Associates and published by Viacom New Media in 1995 for the Sega Genesis and SNES based on the animated series of the same name on Nickelodeon.
Plot
In order to graduate from Monster Academy, three young monsters, Ickis, Oblina, and Krumm, need to pass their Monster Midterm Exam. This test has them scaring a number of people that their headmaster, the Gromble, instructs them to scare in order to pass the exam.
Gameplay
Playing as Ickis, Oblina, or Krumm, the player explores various locales collecting specific items and scaring specific people the Gromble instructs the player to. The characters start out in the sewer and progress through levels above the human world. Players can switch between each character at will and each has their own special ability that often can be used to solve puzzles or overcome obstacles: Ickis can fly for a short time, Oblina can reach high ledges, and Krumm can scan off-screen areas.
From Wikipedia (CC BY-SA 4.0).