Roblox announced in July it had more than 150 million monthly active users and expected to earn more than $250 million this year.

In July, gamers spent 3 billion hours playing Roblox, twice as much time as in February. San Mateo-based Roblox is big business: It amassed $2 billion just from mobile players last week.

Earlier this year, Roblox said its platform had over 150 million monthly active users (MAUs). The site tracker RTrack claimed that between February and July, its MAUs grew 35% to 164 million.

Roblox expects its development community to bring in more than $250 million this year. The company revealed the news at its sixth annual Roblox Developers Conference, which was held online as a result ...