Yes they do. You can't buy individual games but they break the early rounds up by sessions (2 games). I'd recommend buying both sessions because it's worth it. The FInal Four is for all 3 games only.
I would take the initiative to contact them yourself. Also check outThe Link It allows you to reserve tickets in the form of dibz to final four. Its like a stock market to so if you don't want to hold on to your reserves then you can sell them