Presumably due to the popularity of the System 16 version, Sega's Tetris got ported to the Sega System E, which is basically Master System-based hardware.
Unused Audio#
This game doesn't have a built-in Sound Test menu. If you want to hear them yourself, you'll need to use the "Sound Test" MAME cheat included in Pugsy's Cheats.
Sound ID 0x6 is "Danger" music. Unlike the System 16 version, it never gets played in this version.
Sound ID 0x10 (16 decimal) is the sound the monkey plays in the System 16 version after the player dies. As no monkey exists in this version, its associated sound goes unused here.