Tetris 2 + Bombliss (NES)

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Change Music

The game doesn't present you an option to change the music, but if you pause the game while playing and then press Select, you can choose from 7 songs.

Harder Stages in Contest Mode

Complete the first 30 stages.

Memory Clear & Line Blocks

At the "Select Player" screen, enter the "Eliminate Name" menu. Highlight "Exit", hold Down + A + B on controller 2 and press Start on controller 1. If done right, you'll have the option to delete all the save files at once. If you do so, press B at the "Select Player" screen to go back to the title screen and select "2 Players". While playing, all the blocks will be Line Blocks.