Tetris DS - Platform: Nintendo DS

Endless Mode in Standard Mode:
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To unlock this, you have to finish Standard Mode. (Get over 200 lines) This 
will be accessible as a switch when picking the Level in Standard Marathon Mode.

Unlockable Music Tracks in Sound Test:
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These tracks are obtainable via Standard Marathon Mode.

Ancient Tetris (Tetris GB - Music A) - Get to Level 19
Balloon Tetris (Touch Mode Theme)    - Get to Level 14
Basement Tetris (SMB 1-2)            - Get to Level 3
Bowser Battle (SMB 1-4)              - Get to Level 10
CongraTetris                         - Finish Marathon (Get over 200 lines)
Mario Tetris 3 (SMB 3 Overworld)     - Get to Level 4
Rushed Tetris                        - Get to Level 16
Tetris Climber (Ice Climber Theme)   - Get to Level 15
Tetris DK (Push Mode Theme)          - Get to Level 13