What Game Boy Tetris mode is the endless marathon mode?

What Game Boy Tetris mode is the endless marathon mode? A-TYPE is the endless, score-chasing mode in the original Game Boy version of Tetris. Players keep clearing lines as the pieces accelerate, with no fixed line target ending the session.

A-TYPE is the game's open-ended endurance format: the goal is to survive and build the highest score possible. The level rises whenever the player clears ten lines, increasing the falling speed and changing the scoring multiplier. Because there is no prescribed finishing line, the run ends when the stack reaches the top of the playfield.

B-TYPE is the main source of confusion. It uses a pre-filled field of randomly arranged blocks and asks players to clear 25 lines, so it is a challenge mode rather than the endless marathon. The Game Boy release also included two-player competition through the Game Link Cable, making it an important early multiplayer handheld game.