Last week Facebook gave mobile game publishers in its Messenger platform the ability to monetize their games with purchases and ads, a direct challenge to Apple's App Store supremacy.

Today, TapResearch released insight into who's playing Messenger games. And Facebook has a ways to go. While 80% of mobile gamers use Facebook Messenger -- more than double the number that use Snapchat -- only about half of them have played a game inside Messenger. And of those, two thirds played some time in the last month.

Messaging apps mobile gamers use The biggest problem, according to Tap Research, is awareness: "Of the 62% that have never played a messenger app game, awareness was the number on reason they have yet to play," Michael Sprague, VP of business development at the company, says.

The most popular games, according to the 1,070 mobile users the company surveyed, are puzzle and word games, followed closely by action and triva.