Proto:Tempo Jr.

As with the 32X companion, all the prototypes documented here were released by drx as part of his huge Sega prototype leak on February 23, 2008.

General differences

 * No Sega Club logo when booting the game in the U.S. region
 * The only sound effects that exist are for playing the notes
 * No thought bubble showing which direction the player should go.
 * No music is present
 * The number of lives a player has is shown in the bottom right corner during the gameplay rather than in the pause menu
 * Katy doesn't appear when the player wins a level
 * The golden note has yet to be implemented
 * Instead of getting an ending, the players gets a message saying "TEMPO TEST ENDING".

Aesthetic differences
Tempo has been re-drawn on the title screen to make him similar to the 32X version. Also, the logo was re-drawn, partly because of the name change.

The notes on the password screen were colored in.

The pause menu added a couple of extra statistics and got a new font for the final version.

Level Differences

 * The moths have a screwed-up palette in the dance club stage
 * The first level's boss is different
 * No collision on the spikes in part 2 of Level 4.
 * Some of the boss levels, including the final boss, are missing. The player instead plays a glitched version of the first boss's stage, with a sign saying "Now Making!"

The first bonus game has a completely disorganized layout, compared to the final version. It was probably re-organized in the final version to make it easier for younger children.

The second bonus game, Hit & Hit, is completely missing, although its graphics are present.