Alex Kidd in Shinobi WorldSMS

The Dark Ninja, who was banished 10,000 years ago, has returned to rule Miracle World. He also takes young Alex's girlfriend and use her as a sacrifice. To help Alex defeat the Dark Ninja and rescue his girlfriend, a god enters Alex's body, causing Alex to become a ninja master.

There are four rounds, with three levels each. Alex travels through locations like office blocks, construction sites, shipyards, and jungles. He must go through each level defeating ninjas, wildlife and others.