Muppet Adventure: Chaos at the Carnival is a video game released for the Nintendo Entertainment System in 1990 by Hi-Tech Expressions. It is a conversion of a game originally released for the Apple II, Commodore 64 and DOS platform in 1989. The game features Muppets created by Jim Henson in a series of carnival-inspired mini games searching for enough keys to rescue Miss Piggy from Dr. Grump. While the game was intended to be the first in a franchise, no sequels were released.
The NES version of the game is unique from its computer counterparts in that it has a on-screen hearts designating hit detection, but eliminates the two-player mode, one of the carnival levels and requires the player to complete each level with a specific character. The initial levels, which you can complete in any order, are as follows;
Kermit the Frog rides an inner tube down a river, Fozzie Bear must escape a Fun House of desserts, Gonzo flies a space ship and Animal drives a bumper car. After completing these initial levels, the player then controls Kermit the Frog, armed with a feather, in Dr. Grump's castle.
Source: Wikipedia, "http://en.wikipedia.org/wiki/Muppet_Adventure:_Chaos_at_the_Carnival," available under the CC-BY-SA License.