Walk the Tube: The Alimentary Term Builder

The digestive tract gives one combining form to each stop along a nine-metre tube, so a term built from those forms tells you where before it tells you anything else. Snap a prefix, one to three combining forms and a suffix together, and watch the combining vowel survive or drop. The rail on the right lights up the stop you just named — then switch to Challenge and build the term a chart would actually use.