Head on over to the UnMario Wikia. Be sure to register an account if you haven't already.

From Unmariowiki

Mario Mart is a shopping/Racing game. It is a spin off of the Mario Fart games. The player races through many markets to spend the most amount of money. It has many features, including one which is unlockable. The game had a story mode, in wich an ad came up on tv, saying wich person could buy the most useless stuff would get a 5636% discount on all items. Getting a useless item will boost the players speed- while getting a non useless item will slow the player down.