Alex Kidd: High Tech World is a side-scrolling video game with platforming and adventure elements, released by Sega in 1987 for the Sega Master System, that is part of the Alex Kidd series. It is a modified version of the Japanese Master System game Anmitsu Hime, which was based on a manga series of the same name.
Alterations made to the English version included altered sprites, English text and a different storyline. Because the game wasn't conceived as an Alex Kidd game in Japan, these alterations caused inconsistencies for the Alex Kidd storyline in The West, such as an appearance of Alex's father in the very beginning of the game, even though his father was missing in Alex Kidd in Miracle World, until being found at the end of Alex Kidd in the Enchanted Castle. Furthermore, while a large variety of characters exist in the game, none of the previously established characters in the Alex Kidd universe are anywhere to be found, nor do any of the characters in this game appear in any of the others in the series.
Alex also has a brother by the name of James in High-Tech World who is never mentioned in any other games in the series. (Though it possibly could be his brother from Miracle World, Igul incorrectly named.)
Alex Kidd is contacted by one of his friends, who tells him a new arcade, High Tech World, has opened in town. Alex has a map to its location, but it has been torn into eight pieces, and is needed to find the arcade before it closes at 5:00 sharp. He solves puzzles, answers questions, runs errands and does housework to find the pieces. However, once he finds the pieces of the map, he learns that the front gates are shut, and thus is unable to leave. Using a hang-glider to leave the house he lands in the forest. On his way to the arcade, a clan of ninjas appear, who attempt to kill him. Upon fighting through the forest of ninjas, Alex finally makes it to the Arcade.
The object of the game is to get through five stages. Half the stages contain puzzles to progress and people to talk to, while the other two are linear levels with enemies along the way. There are a variety of ways to die in the puzzle stages, when Alex has some sort of accident or does something he shouldn't.