Shoot zombies, watch their heads fly and blood splatter. Flick your finger and roll a virtual cigarette. Snap a photo and see what you look like with bigger breasts.
It's all possible from a smartphone or tablet, and most of those games littered with violence, vice and sex are at the screen-tapping fingertips of children -- often for free.
That's why mobile apps are the next frontier in the national battle over parental ratings. As app games explode in popularity, along with the devices that run them, industry leaders and watchdogs are jockeying for position amid debate over a standard ratings system -- much like movies and video games.
"The whole mobile world is a complete Wild West," said John Simpson of nonprofit group Consumer Watchdog.
App ratings vary by seller, with Apple offering different guidelines than Google's Android market, for example. Parents have questioned the validity of those rating categories, which are typically suggested by the app developers themselves. The mishmash gives parents one more thing to worry about when trying to keep adult content out of their children's hands.
"We must move beyond the alphabet soup of game ratings and consolidate behind a single standard that consumers will recognize and, ultimately, demand," John Riccitiello, chief executive of video game maker Electronic Arts and chairman of the Electronic Software Association, said late last year.
The discussion, already simmering, will grow louder as smartphones, tablets and apps multiply, adding to the deluge of current offerings.
In 2012 alone, Apple reported 20 billion app downloads -- equaling the number of apps downloaded in all previous years combined. The number of new apps being produced dwarfs the entertainment offerings by Hollywood and video game makers with 1,600 new apps debuting every day, according to some experts.