World of Goo (2008)

The 2008 original starts with simple structures and short Sign Painter messages, then changes the gap, available goo or support points. Building makes the lesson tangible: a sagging tower shows why a wider base might matter. It is a good example of teaching through a small experiment and its visible consequences. Read the signs, then try a modest structure before chasing the best possible result. Later contraptions can be difficult even when the basic construction rule is clear.