Recs.
Updated
Roblox was released in 2006, which was a few years earlier than Minecraft, and focuses more on creating games. Young game developers get to practice and expand their creativity. Players are encouraged to interact and explore. With 30 million active monthly players, Roblox is certainly growing as fast as the people who uses it.
Specs
Pros
Pro Offers a safe chat mode for kids under 13 and a parent's login
Since Roblox is used mostly by younger players, a primary concern for parents when it comes to interactive and multi-player online games have always been the safety of their children from online predators and inappropriate behavior. Roblox has this covered with their safe chat mode, and a parent can also monitor their child's activity and account settings.
Pro Enjoy creating and playing your own game or thousands of other games available
You can create your own original game and play it, and have others play your game too. As of 2017, Roblox has over 500,000 game creators designing games. That's a lot of games made by players like you, so you'll never run out of options on what to play.
Pro The game is free to play
You'll be able to create your own games and play without paying for anything. Though they do have virtual currency that they call Robux, which you have to buy with real cash. You only have to do so if you want to upgrade the look of your avatar or get optional in-game power-ups. Like with most games, if you have the patience you can additional items over time, then you don't have to spend a dime.