If you have a soft spot for simple to grasp, difficult to master twitch games that you can play on your iPhone with just one hand, like I do, a pretty cool one launched yesterday called The Firm (Free) from Sunnyside Games. The goal is pretty simple: buy green-colored stocks when they’re on the rise, sell them when they’re in decline. You buy and sell by simply swiping the stock certificate that slowly rise up your screen either right or left.

Sounds simple enough, right? Well here’s the twist: There are red stocks too, and just to mess with your brain, those stocks you want to sell when they’re on the rise and buy when they’re in decline. So pretty much the exact opposite of the green stocks. As mentioned, the stock certificates are constantly rising from the bottom of your screen, so if you aren’t quick enough in making your buy/sell decisions and the stack hits the top of the screen, you’re fired.

The Firm is one of those games that looks so easy on the surface, but it’s actually like a cerebral tongue twister. You see a graph of a stock on the rise and your first instinct is “Buy!" but then you hesitate as you question yourself, “Wait, is it a red stock or a green one? Which direction do I swipe this stupid thing–oh no now I’m getting near the top of the screen oh please somebody help me… aaaand I’m fired." It’s that perfect kind of frustrating-but-compelling experience that suits mobile so well, as you can fire it up at a moment’s notice and kill whatever amount of free time you have. It’s also a great high score game to compete with friends on, and we all know how popular that can be (cough Flappy Bird).

So, if you’re looking for a new twitch game for your phone ahead of all the new releases hitting tomorrow, particularly if you like games that test your reflexes with left/right situations like Timberman ($0.99) or my own personal favorite Critter Panic ($1.99), then toss a buck at The Firm and hit up our forums to brag about your high score.