The game that made Muhammad Ali tweet

The greatest of all time can’t hide his excitement for a new mobile game, and he’s talking about it on social media — of course, it might have something to do with the fact that you can play as him to kill zombies.

Boxing legend Muhammad Ali is joining the roster of playable characters in the mobile zombie brawler ShaqDown 2. He teams up with martial-arts filmmaker Jet Li and retired NBA star Shaquille O’Neal, who is also the star of game. The celebrities make up a team of superpowered celebrities who fight off waves of the undead in Los Angeles. The free-to-play action app is available now on iOS and Android.