Like so many overly simplistic mobile games, this arcade-style tennis game has so little to offer that it quickly becomes redundant and dull. In Heavy Metal Tennis Training, you're on a tennis court in Hell, practicing your swing with the help of a ball machine. Except the tennis balls that it shoots at you are on fire, and if you miss, you get burned to a crisp. This is why you not only want to hit the ball over the net, but also want to try and hit the ball machine, breaking it, and thus ending your torment.
As for what makes this "heavy metal," well, let's just say this is decidedly more Bon Jovi than Metallica. Sure, you can play as Sammy Lee Moth, Uzzy, or Queen Helizabeth, and the logo blatantly rips off Iron Maiden, but Mylie Cyrus has been more metal than this. Heck, even the game's music isn't metal; it's just old school arcade blips and beeps played fast in a cheap imitation of metal. What's worse, though, is that because all you're doing is tapping the screen at the right time — something most gamers will get down after a couple games — and don't have to move or even chose between hitting it backhand or with a spin, there's little reason to play this for long.