Chack'n Pop

"Chack'n Pop (ちゃっくんぽっぷ Chakkunpoppu) is an arcade game released by Taito in 1983, considered to be an ancestor of Bubble Bobble due to the appearance of many similar enemies and Bubble Bobble's duplication of a Chack'n Pop level. The arcade rom set also contains unused graphics for the mechanical wind-up "Zen-Chan" that later appeared in Bubble Bobble." Source: Wikipedia, Chack'n Pop, available under the CC-BY-SA License.