Okay, I'm going to be that guy I'm afraid.

During his elementary school he made a Star Trek Shooting game with his dad. In High school he created jeopardy game and the once very famous tetris game.

It should be "He created a jeapordy game and a tetris game which was once very famous", yes I know, it just really bothered my this line because it implies he was the original creator of it if you take it literally.