Petko is an unreleased point-and-click adventure game developed by the Austrian company Max Design. It was originally planned to be released in fall 1995 and it was re-announced by Tale Factory in 1998, but it never saw the light of day. The story is about a guy called Petko, who won a journey to San Rico Island.

In this video, you can see the playable demo version that was published in around August 1995. Since it's in German only, I provided some subtitles. If you don't see them, you might want to turn them on by clicking the arrow button on the bottom right of the video player. (less info)