Does this game have a basic Tetris mode without the need to battle? I'm looking for a simple Tetris game.
Yeah, but as with all modern officially licensed Tetris games, it follows SRS rules, so it's pretty much impossible to lose once you figure out how to abuse the rotation system. Last time I gave endless marathon mode a serious attempt I lasted about 90 minutes before just quitting from boredom. :V
The three solo Tetris modes are your standard Marathon, Sprint, and Ultra modes that have been staples since at least the mid '90s. The other battle modes can be played against humans or AI, 2 to 4 players.
I made a video demo of most of the gameplay modes a while ago. Timestamps are in the video description, and there are 2 solo Puyo modes that I didn't bother recording.