SGB Test Program

SGB Test Program
Developer: Nintendo Platforms: Game Boy, Super Game Boy This game has unused code. This game has unused graphics.

This page or section details content from the July 2020 Nintendo Leak. Check the July 2020 Nintendo Leak category for more pages also sourced from this material.

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The SGB Test Program is a Super Game Boy software development kit demo that was intended to test enhanced Super Game Boy features, and there is also code for Super Game Boy sound function support. A build dated April 1994 was found among the July 2020 Nintendo leaks.

The program features the Super Game Boy's "Goon" mascot. Four of them appear in a yard-like setting as spinning heads, and the player is able to control one, or up to four with four SNES controllers. The player is able to fire a star-like character at three others by pressing A/B, which can defeat them. After being hit, the Goon will start spinning slower before disappearing. If the star is close enough to the target, it will move in a path.

Using Isxc-0.5, the Test Program (Game Boy ROM with SGB enhancements) can be compiled from sgb.isx from the leak at CGB\CGB\AZL__ゼルダの伝説 夢を見る島DX\Source\Disk1\ゼルダの伝説_JP3_US3_EU2\DEMO_zelda\sgb\SAMPLE\.

Unused Graphics

Graphics of Kirby are present in the ROM, but they only seem to appear after firing for a very brief moment. Unused code, possibly left over from an earlier version of the SGB Test Program, turns Goon sprites into Kirby ones. It can be re-enabled with Game Genie code ??3-D2F-195 (where "??" is any non-FF value).

Yoshi Palette

There is code for a green "YOSSI" palette.

(Source: BSB (previously inspecting CHRDAT.COM), nensondubois (compiling the ROM, analysis including Game Genie code))