Puyo Puyo Tetris is a combination of the Puyo Puyo and Tetris series in which the player battles through seven chapters of 10 stages each, playing as a total of 26 characters in the hopes of determining which puzzle game series is the better of the two. As usual, the objective is to score chains and drown opponents in a wave of Nuisance Puyos and/or extra blocks. But the rules change every time - one match might have the player(s) swapping between Puyo Puyo and Tetris fields, while another may allow them to use items to hinder opponents' progress. Also, at certain points, the player will encounter challenges, where the objective is to reach a certain goal before time runs out.
The traditional battle mode is of course still intact, with up to 4 players battling for Puyo (or Tetris, or who knows? Maybe both) bragging rights.