"Hoop Connect Duel 2021" is a free game available on the iPhone platform. The game, developed by Virtual Proz, offers a casual take on the classic connect 4 Hoops arcade game. Players are required to connect basketballs in vertical, horizontal, or diagonal lines to achieve victory. A unique twist in the game involves disrupting the opponent's stack to prevent them from winning, adding an element of strategy and competition to the gameplay.

The gameplay in "Hoop Connect Duel 2021" revolves around connecting balls strategically while keeping a close watch on the opponent's moves. With its engaging mechanics and competitive edge, this game provides an entertaining experience for players looking for a challenging yet fun puzzle game on their iPhone.