Zoo Keeper is an arcade game created by Taito Corporation and released in 1982. In the game's storyline, the player's character, named Zeke, is a zookeeper whose girlfriend, Zelda, has been kidnapped by a malicious monkey. To distract Zeke, the monkey has unlocked the cages in the zoo, allowing the animals to escape. The player must control Zeke to run, jump, build walls, and collect bonus items in an effort to recapture and contain the animals before finally rescuing Zelda. Source: Wikipedia, "Zoo Keeper (arcade game)", available under the CC-BY-SA License.