Wario Land 3 is a bootlegged game for the Sega Genesis (also known as the Mega Drive) that is, in actuality, a hack of Puggsy, which was a popular platforming game for the Sega Genesis that included an interesting anti-piracy feature, which uses a SRAM check to see if the game is on the Cartridge and a 'legit' copy. When it is able to write to a selected area (chosen by the game), it brings up an error message and will not let you pass after the 5th stage.
Nothing really that significant has been changed from the original game; it seems that Puggsy himself has been converted to a sprite of Wario, which keeps the arms, hands, feet & body structure, slightly edited and recoloured from Puggsy, with a new head. and the title screen has changed. Not much is known about this game.