Xplorer 64 is a homebrew game for the Nintendo 64. Being homebrew, details about its development team are likely scarce.  The gameplay might vary depending on the version, but generally involves exploration and adventure. The (Germany) and (Unl) notations might indicate a specific regional release or an unlocked version.  The version number suggests multiple iterations of the game.

Xplorer 64 (Germany) (v1.067) (Unl)

X-Mas Super Mario 64