The majority of test gamers were unable to complete the first level of Super Mario Brothers.
Around 90 percent of the test participants were unable to complete the first level of Super Mario Brothers. We did not assist them in any way except by providing the exact same instruction manual we used back then. Many of them did not read it and the few that did stopped after the first page which did not cover any of the game mechanics.
We watched the replay videos of how the gamers performed and saw that many did not understand simple concepts like bottomless pits. Around 70 percent died to the first Goomba. Another 50 percent died twice. Many thought the coins were enemies and tried to avoid them. Also, most of them did not use the run button. There were many other depressing things we noted but I can not remember them at the moment.