Wastewater treatment, collections or water treatment: pick one. Then set the level you have now and the one you are studying for.
Levels go from easiest to hardest. Choose your state or province to see your own level names.
Text grows and wraps; buttons and screens stay where they are.
A tap you can feel when you press a button, start practice or a course, or check an answer. Works in the iPhone app and on most Android phones. iPhone Safari gives a lighter tap.
Starts narrated lessons, such as the Laboratory course, with the sound off. You can still turn it on in a lesson.
More languages are on the way.