qtrex: QTrex (Qt4 3D Tetris) qtrex: qtrex: QTrex is a puzzle based on the popular Tetris video game. However qtrex: instead of a well-shaped playing field the user has a circular one. The qtrex: game is controlled via standard buttons. qtrex: qtrex: qtrex: qtrex: qtrex: qtrex: