Roblox - Free
Think of Roblox as a giant online community and a game creation engine. Build something cool and you can share it with friends on their iPhone, Android device, Xbox One and their Windows PC. Players have already created theme parks, racers, superhero RPGs and designed their own online hangout spots to relax with friends.
Roblox is free to download, but there are in-app purchases. You can buy new avatar gear created by the game’s developer or pick up new worlds and upgrades from the game’s community store.