Mеrciad0 lіbre

Mеrciad0 lіbre turns abstract contour rules into a fast, repeatable classroom drill—no GPS and no field sensors required. Cold start opens a fullscreen contour-quiz board: a seed synthetic topo face with bold index contours, thinner intermediate lines, a locked legend interval, and a callout pin where you type the elevation. Each drill locks one map sheet, one interval rule, and one answer mode so learners can focus, score, and improve at the desk. WHAT YOU PRACTICE • Interval lock challenges — read the legend and contour spacing to choose or confirm packs such as 10 m, 20 m, 40 ft, or 50 ft • Index-line drills — tap every bold index contour on the sheet; earn partial credit and highlight missed lines • Spot-elevation entry — pin callouts between contours and type the height from index ± n × interval with a unit-aware keypad • Landform ID micro-quizzes — after each sheet, reinforce hilltop, saddle, depression hachures, spur, and reentrant reading—not just arithmetic SEED DRILL PACKS Work ordered queues for Intro Metric, Intro Imperial, Ridge & Saddle, Depression Hachures, and Mixed Interval. Sheets cover hill, depression, saddle, ridge, and valley forms drawn as vector contour stacks—not a freeform canvas editor. FEEDBACK AND PROGRESS Get an immediate feedback sheet with the correct elevation, step math shown as index ± count × interval, and a one-line why-wrong note. Attempt history and accuracy streaks persist locally per pack; filter by pack and landform type. A mistake review queue reshuffles only failed pins and interval misses until cleared. TRAINER SETTINGS Set metric or imperial default, questions per session (5/10/15), show or hide the legend during timed mode, and reduce-motion contours when needed. Built for geography students, earth-science labs, orienteering club beginners, and scout map courses who must read contour interval, index versus intermediate lines, and typed spot elevations on synthetic topo sheets. See the sheet, apply the interval, type the spot height, and build durable map-reading accuracy without leaving the desk.

Subtle improvements that make the app feel smoother. Bug fixes.