Again for you, again a platform, an NES exclusive at its release time and a pretty good one if you ask me. Scrooge McDuck wants to be the richest duck in the world, will he succeed? Discover it watching this walkthrough...
(From Wiki)
DuckTales is a video game based on the Disney animated TV series of the same name. It was first released in the United States for the Nintendo Entertainment System by Capcom in 1989. In this game, Scrooge McDuck travels around the world collecting treasures to become the world's richest duck. The game was also ported to Game Boy. This game is unrelated to DuckTales: The Quest for Gold, which was released on a variety of personal computers in the early 1990s.
DuckTales is often a subject of NES-related nostalgia and was generally popular. The game provides a good example of the work produced by Capcom in the late 1980s and early 1990s, along with such titles as those in the Mega Man franchise; both shared key personnel such as Tokuro Fujiwara, Keiji Inafune and Yoshihiro Sakaguchi. DuckTales has much in common with the Mega Man games: bright and colorful graphics, tight play control with unique gameplay dynamics (such as using Scrooge's cane as a weapon, tool, and pogo stick), and non-linear gameplay.
The player controls Scrooge McDuck, the richest duck in the world, on a quest for even more treasure. Scrooge can jump using the A button; his cane is used as a weapon to defeat enemies or strike objects (B button) and as a pogo stick to jump higher (A then B + Down). There is a wide variety of helpful non-player characters and enemy characters.
DuckTales comprises five levels that can be played in any order (similar to the Mega Man games). A boss guards the treasure that Scrooge seeks at the end of each level. There are also two hidden treasures: a golden ring in the African Mines level and a golden mirror in the Moon level. Upon finishing all five levels, the player is directed back to Transylvania for the final boss fight. DuckTales contains some non-linear gameplay, in that the player can revisit levels to get items that unlock parts of other levels.
The NES version of DuckTales contains an alternate ending shown when the player finishes the game with at least $10,000,000 and has found both hidden treasures. The alternate ending consists of the same newspaper at the end of the game except the picture shows Scrooge McDuck with a crown on his head, and the paper also states that he "stunned the world with his discovery of 2 Lost Treasures."
There is another, lesser known alternate ending, shown when the player finishes the game with $0. Doing so requires very careful planning and is the most difficult ending to obtain. Scrooge is seen sobbing and the newspaper states that he has "lost his fortune in his search for the legendary five treasures. He will use them to rebuild his empire."
Source: Wikipedia