Mega Games 6 Vol. 1 (Europe) is a compilation title for the Sega Genesis, released in Europe. This is part of a larger Mega Games 6 series, suggesting three different volumes in total for this particular compilation.  Each volume would have contained a different selection of games.   Further research is needed to determine the specific games and developers involved. 

Mega Games 6 Vol. 1 (Europe)

Mega Games 10 (Brazil)