Hey, dsopchin,

Sounds like a Jeopardy type game. Is that right? And you don't want to exit the slideshow to search for the right slide because then students/team members could see the questions and get a head start.

Simple, low-tech solution: Make a different PowerPoint for each category. Open them all up and start the slideshows. When you want to switch from one category to another, type Alt-Tab and you'll see all files that are open. Continue to type Alt-Tab until you get to the correct slide show and open it. It will open to the last displayed slide.

You might find higher-tech solutions at http://www.eslgamesworld.com/members/games/pptgames/.