Candy Crush is not just a game. It’s big business.

The addictive Facebook and iPhone game makes $850,000 a day. Why? The supposedly free app has a lot of extra fees for players who want to advance in the game.

Basically, Candy Crush is a “freemium” app, meaning it’s free to download, but users can purchase in-game upgrades for more moves, more lives, more levels, and other add-ons, reports E! These extras are raking in the dough for the folks behind that game that people just can’t seem to stop playing.

AppAdvice.com (via Buzzfeed) revealed last month that Candy Crush developer King.com was earning $633,000 per day, earning upwards of $230 million annually. This makes the app the number one grosser in the App Store.

And it just keeps getting better for King.com. This month, as the game celebrates its one year anniversary (it debuted September 2012), Candy Crush earns $850,000 per day, according to data at ThinkGaming.com. It’s still the top grossing app in the App Store and has held that top spot for months.

Nearly 7.7 million people play the game every day, with hundreds of thousands of new users installing it daily. When you break it down, it comes out to about 11 cents per user, reports E! The cheapest extra is 99 cents.

So one would think that many of those players are spending at least a few bucks to make it to the final level. But King claims 70 percent of users on the last level have never paid a cent.

We’ve never played, but to see the people engrossed with the game on the subway, it’s clearly entertaining. How much do you spend on Candy Crush?