Donkey Kong Jr. is an arcade-style game released on the Atari 7800. In this game, Mario has kidnapped Junior's Papa, and as Junior , players must navigate through four different levels to find keys to free his father. The goal is to reach the final cut scene where Junior will free Donkey Kong and both will escape after giving Mario the boot.
The gameplay involves avoiding enemies such as Snapjaws, electric sparks, and other obstacles while collecting fruit to hit at the heads of foes, scoring bonus points. Junior can also climb away faster by grabbing hold of chains or vines at a time or jumping over enemies. However, falling from great heights or getting wet on certain levels will result in the loss of a life.