Yeh they're games. On HSX, they start you off with a porfolio of $2M (they call it H dollars because its fake and only valid in the game) and you can buy stock in real movies to try to earn profits. Stock prices are based on the estimates of what a film's box office will be after four weeks in theatres. For example, say Alice in Wonderland was priced at $100 per share, but I thought it was going to earn atleast $200M in the first 4 weeks, then I buy shares, and after it opens, the price skyrockets and I sell, making massive gains and add to my portfolio. You buy any movies you want, even if they're coming out years from now, as long as they've been announced by studios and given an IPO (Initial Price Offering).
MMG Mogul is a game where you are given $100 to buy real movies for prices which usually range from $1-$45. All upcoming movies are available and each competition usually last for 3 months each but start at the beginning of every month (Jan-March, Fed-April etc). The site sets the price and the goal is to pick the best slate with the money to end up with the highest cumulative box office. The person with the highest wins. That's the box office game, but there are many other alternatives such as Ultimate and Bankrupt leagues.
I know it doesn't sound very interesting, and actually quite mathematical and confusing, but it's actually really fun and addicting. I've been playing for years.
I've actually been thinking about starting a very simple box office game in this section but I'm not sure how popular it will be.