------------------------------------------------------------------------------------------------------------------------------------------------------------ Tetris DS Codes Unlockables Standard Endless mode Get over 200 lines to complete Standard mode to unlock the "Endless" option when selecting a level in Standard Marathon mode. Music tracks Complete the following tasks in Standard Marathon mode to unlock the corresponding music track at the sound test menu. Ancient Tetris (Tetris GB Music A): Reach level 19 Balloon Tetris (Touch Mode Theme): Reach level 14 Basement Tetris (Super Mario Bros. 1-2): Reach level 3 Bowser Battle (Super Mario Bros. 1-4): Reach level 10 CongraTetris: Complete Standard Marathon mode Mario Tetris 3 (Super Mario Bros. 3 Overworld): Reach level 4 Rushed Tetris: Reach level 16 Tetris Climber (Ice Climber Theme): Reach level 15 Tetris DK (Push Mode Theme): Reach level 13 Hints In-game reset Hold L + R + Select + Start during game play. Devil World reference In Rushed Tetris level 17, the level's background is Devil World and the Sprite is Tamagon, the main character from Devil World. Devil World is a Japanese DS game.