Stacked is not a known game for the Microsoft Xbox. It's possible that the title is either misspelled, confused with another game, or it's an obscure title not widely recognized in the gaming community. If you're referring to Stacked with Daniel Negreanu, it was a poker video game released in 2006 for multiple platforms, including the Xbox. The game featured the professional poker player Daniel Negreanu and included a career mode where players compete in tournaments. Its genre can be classified as a card game or a simulation of poker gambling.