This 1991 2D platformer casts you as Bart Simpson, tasked with stopping Space Mutants disguised in Springfield. The core loop involves platforming across five levels to collect or dispose of specific alien ingredients (like purple objects) while gathering "proof" coins. Unmasking the hidden aliens requires using the crucial X-Ray Specs mechanic, which differentiates this title by adding an observational puzzle element to the action. Success in collecting proof aids Bart against level bosses.
The atmosphere of the game is rooted in the early 1990s aesthetic of the popular animated television series. The narrative tasks Bart with uncovering and stopping the alien threat that has infiltrated the town. To succeed, Bart must navigate five distinct levels, each requiring him to locate and neutralize specific ingredients the aliens plan to use for their nefarious machine.
The gameplay loop centers on exploration and platforming challenges typical of the genre from that time period. Bart must interact with the environment to achieve his objectives. A key mechanic involves identifying the disguised aliens hidden among the townspeople.
To expose these imposters, Bart is equipped with a special item: the X-Ray Specs. Using these specs allows the player to distinguish between regular citizens and the actual Space Mutants hiding in plain sight.
Progression through each of the five stages requires the collection or disposal of specific, often color-coded, items that the mutants are gathering—such as purple objects or balloons. Furthermore, Bart must gather "proof" of the alien presence, often represented by brown coins found by defeating enemies. This collected proof is crucial, as it is required to gain the assistance of family members when confronting the level's boss characters, which include familiar faces from the show.
The primary unique feature is the integration of the X-Ray Specs mechanic directly into the platforming and objective structure. Unlike standard platformers where enemies are clearly defined, this game introduces an element of deduction and visual identification required to progress effectively against the hidden alien threat.
This title saw a wide release across the dominant hardware of the early 1990s. Key platforms include the Nintendo Entertainment System (NES), Sega Master System, Sega Mega Drive/Genesis, Commodore 64/128, Amiga, and DOS, among others.