Penguin Wars (ぺんぎんくんWARS Pengin-kun WARS?) is an arcade game released in 1985 by UPL. It was ported to the original Game Boy (1990), MSX and Nintendo Entertainment System by ASCII under the title Penguin Wars. The Game Boy version of the game is known as King of the Zoo in Europe and Penguin-Kun Wars Vs. in Japan.