As I said, you have to click each tournament (after you scrolled down) to see which games it contains. But in your case, since you know what you're looking for, you should do a search for Spider Line4. You'll find the search options right under the prize tournaments. Use the drop down that says 'all games' and change that to 'Spider Line4' and click 'show'. Now all the tournaments listed (except, still, those annoying prize tournaments) will contain a section called Spider Line4. Note that you still have to click each tournament to get to its sections, and also note that the Spider Line4 section may be closed. Unfortanately, you can't narrow your search to show open sections only.

I warned you it was complicated - but only until you get the hang of it.