"Also, you want to be looking to see how seriously the game takes these types of issues, so is there a very obvious and easy way to report inappropriate activity?
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Mr Gamble said the aim was a visible police presence, similar to officers patrolling the streets, to reassure the public and deter paedophiles.
"The police are going to be there overtly - there is nothing covert about this," he said.
Arnason said the centre is reminding parents to explore online games themselves before their children start playing.
If there's a chat component, parents should know, and find whether it can be turned off or if there are other features to improve safety.
US Customs, the Canadian Mounted Police, Australian Federal Police and Interpol are also involved.
Forces set up sites appearing to offer child pornography.
The Taskforce of international law enforcement agencies aims to make the internet safer for children.
National Crime Squad (NCS) Assistant Chief Constable Jim Gamble said the aim was "reassurance through visibility".
The site claims to have more than 44 million users worldwide and includes a chat feature.
The Centre said it has received reports about requests to meet in person and sexually suggestive chat messages being sent to children within Roblox using the site's chat feature.