isn't this just that game we had as kids where there was a picture that was all jumbled up and you slid the tiles around to unscramble it?

http://www.tilepuzzles.com/default.asp?p=17

This has a similar name but no. You are give 25 spaces with 24 spaces filled with tiles. The goal is to slide the tiles around using the empty space until they are in order from 1 to 24.

yeah pretty sure you've described the same game with numbered squares instead of a picture

I guess you could say that.