There are a lot of things you can do with KnowCards. They aren't designed for one particular game or activity, but rather as a tool that can be adapted for various uses. Here are a few. You can also submit your own.
Brainstorm what you might do with a potential programmable product or kit before buying it
Plan what the bare minimum of components for a particular project could be
Compare component options within a subcategory (Which display should I use? What kind of motor?)
Make collaboration and communication between designers and engineers more concrete ("It needs to sense if it's falling over, so we need an accelerometer, right?" "Why don't you just use a tilt sensor?")
Explain product plans to people with limited background in hardware ("This bit will tell this bit to move when there's light.")