RUTEdu is an interactive educational app for high school students, developed at PRZ (Rzeszów University of Technology). Features: * Math lessons: algebra, equations, fractions, percentages, geometry, statistics * Interactive periodic table of all 118 elements * Chemistry quizzes with automatic question generator * Chemical equation balancing with number keypad * Geography quiz with interactive map (click-a-country) * Duel: two-player battle on one phone, works with every lesson * Progress tracking and per-subject question configuration * 29 European languages, light and dark theme No ads, no tracking, no internet required (except map quiz).