Fig 1. Some Moravec screenshots.

(a) Initial screen with the logo and four buttons: Play (“Jugar”), Practice (“Práctica”), Tutorial and Statistics (“Estadisticas”). (b) One of the many tutorial screens explaining the algorithms and with a link to a youtube tutorial video. (c) One of the statistics shown. It plots RTs as a function of the trial number for 2-digits square operations. (d) In the “Practice” section the user can choose which operation to train. For each operation three difficulty levels can be chosen: initial, medium and advanced. In the advance practice, problems are shown for 5 seconds and then disappear while in the other cases its remains visible until the user press enter (see (e)).