# What is the big idea behind Tanks?

Each of the three puzzles in the new *BrainQuake* app has some mathematical features different from the others, reflecting the different ways mathematics is used in the world.

The *Gears* puzzle is all about optimization, almost certainly the single most common use of mathematics in today’s world. *Gears* is not about finding a unique answer (many important real-world problems do not have a unique correct solution), rather finding better answers or an optimal answer. *Tiles* is about finding ** an** answer when there are several–or maybe many–correct answers. (Also common in real world applications of mathematics.) And

*Tanks*puzzles all have unique correct answers. (Yes, the real world keeps presenting problems of this kind as well.)

Those are not the only distinctions, though. Another is that, although all three puzzles break the Symbol Barrier, they do so in ways that differ in some regards.

*Gears* does so in a deep way that presents mathematics usually regarded as high-school or college level in a manner that is accessible to a middle schooler. On the face of it, *Gears* (the puzzle that constituted our launch app *Wuzzit Trouble*) is an (elementary) arithmetic app, but in point of fact the mathematics it involved is (advanced) algebra.

*Tiles* looks like a spatial reasoning app but in addition to spatial reasoning it presents problems involving linear functions and growth. The earlier posts about *Gears* and *Tiles* in this blog, linked above, provide illustrations to show how the puzzles encode the mathematics.

With *Tanks*, however, it’s almost a case of “what you see is what you get.” It’s self-evidently about ratios, proportions, and fractions. It breaks the symbol barrier and achieves much of its learning power in an explicit and easily recognizable manner, by providing *a mechanism to explore* those concepts.

[I said “almost” just there because more advanced puzzles require much more than mastery of basic fractional arithmetic. As with all our puzzles, the ultimate focus is on number sense, mathematical thinking skills, and creative problem solving capacity. See how you do when you move up the levels in the *Tanks* puzzle. If you are like others who have played *Tanks*, you are likely to find yourself saying, “This one cannot be solved. There must be a bug.” Well, we’ve tested the puzzles a lot. While we cannot say with 100% certainty there is not a bug we’ve missed–this is software after all–it is pretty unlikely. Much more probably, you need to keep trying to find a solution.]

Since *Tanks* “wears its mathematics on its sleeve,” rather than throw more words at you, let me show you some of the more basic *Tanks* puzzles in action. They are all super-short videos. (These all have two output tanks. More advanced puzzles have three or four output tanks––though higher level puzzles with just two tanks can be fiendishly difficult.)

You’ll find lots more where those come from on the *BrainQuake* app.

– Keith