Don’t mistake this as an regular puzzle game, like Tetris. While it has the word Tetris in it’s title, the concept is not about lining up a row of blocks to make them disappear from the screen, but to try to prevent any falling blocks from hitting the ground. Catching all the blocks in a room advances the player to the next one. If an block hits ground, or you get hit by a missile, you’ll lose a life. Clearing all rooms let’s you enter your name at the highscore table. After closing the highscore table, the game restarts from the beginning again.
Being the first game in the series, it is quite simple, and also has somewhat acceptable difficulty. The game has no title screen.