"Well recommended for any sci-fi/RPG fan; 4. 5/5" -Super Game Droid. "Great Galactic Action, 8. 2/10" -Tapscape. "The RPG elements make the game look like a mobile version of Mass Effect. " -Baixaki. Metal Earth: The Gray Matter is an action packed gaming app for the Android" -Techclones. Featured on AndroidTAPP's App Weekender: 30 Hot New Apps to Try. Fast paced Action RPG.