No, not nuclear powered submarines as I initially thought. We're talking about the American sandwich things, here.
I don't know if you've ever been in that particular chain of sarny shops, but if your experience of ordering a build-your-own-butty is anything like mine, it's probably not going to help you achieve the high scores in I-play's adaptation of the hit PC game, Turbo Subs.
This popular time management game puts you in charge of creating successful new sandwich shops in the most peculiar sites around New York City. Alongside building sandwiches for the most impatient city in the world, you'll have to fend off villainous thieves and refine a recipe your very own secret sauce.
Turbo Subs includes 60 levels of fast-food fun, eight different types of angry customers and an all-new touchscreen interface built specifically for the iPhone.
Head on over to the App Store and order yourself a foot long feast of fun now.