Super Boy 1 (Unl) suggests a game that might be unlicensed or a homebrew title for the Sega Master System. "Unl" likely stands for unlicensed.  The game's content and gameplay style would highly depend on the developer's creativity and may differ vastly from commercially produced games.  This could range from simple arcade-style games to more complex experiences.  Without further information, the game's details remain unknown.

Super Boy 1 (Unl)

Sukeban Deka II - Shoujo Tekkamen Densetsu (Japan)