I’m sure that you’ve seen this kind of puzzle before: given a graph, trace a path that visits each vertex and edge only one time. Normally, this kind of thing is presented in a math class of some sort (you’ve just gotta love Euler!) but there have been more than a few games of this sort come out, one of which is One Touch Drawing from the fine folks over at ECAPYC.

One Touch Drawing is an example of a perfectly fine way to waste a couple of minutes while you’re waiting for the bus – or riding the bus for that matter. The premise, for those that are unfamiliar with the objective, is to make a single unbroken path from one vertex through every other vertex without going over an edge twice. Doing so is simple enough, use your finger (or other pointing object) and pick a starting point then begin drawing along the lines. As you move from point to point a dark blue line covers up the areas that you’ve already traversed and prevents you from taking that path again.

Should you happen to take ten attempts and still not be able to figure out a correct path, then you can ask for a hint which will let you know which vertex you should begin the path from. Many of the early designs are something of a cakewalk and the difficulty ever so slowly does ramp up. There are two different modes to play in One Touch Drawing. The first is the basic mode where you progress through the levels one by one. The second – and perhaps more interesting – mode is survival mode. You can think of survival mode as a “hardcore” mode where you progress through each level until you come up with an incorrect path, at which point you have to start back over from scratch.

One Touch Drawing isn’t a game that will knock your socks off or wow you with insanely awesome graphics and sound effects. What One Touch Drawing will do is provide you with a decent medium with with you can just sit back, relax, and take a stab at solving one or two more screens to get to the next one. It’s free and it’s only a download away, so even if you’re not familiar with the mathematics that are behind the idea why not give it a chance?

One Touch Drawing is available for free on the Google Play Store

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