Five parts of the same visit: a named level, essays that mark themselves only at the last line, a chronology, locked quizzes, and a profile that survives a reset.
01
A level named for the engineering, not a badge
The top of Home states the level you are in, fills a bar, and reads “X of Y quizzes completed.” A level clears only after all four of its quizzes are finished once, at any score. The path runs Industrial Origins, Early Water Towers, Mining Structures, Steel Construction, Radio Engineering, Television Towers, Modern Tower Design, and Engineering Heritage.
02
Tower Archives with a read mark that means the end
Search by title or filter All, Water Towers, Mining Towers, Steel Structures, Radio Towers, and Television Towers. Cards show topic, a one-line brief, and reading time, ordered from the earliest industrial towers to heritage preservation. Scroll an essay to the last line and it earns Read. Opening it halfway leaves it unmarked, and none of it changes your level.
03
Five periods, oldest event at the top
Switch eras with arrows or jump to the start or end of the scale: Early Industrial Development (1700–1799), The Age of Iron and Steel (1800–1899), The Rise of Communication Towers (1900–1949), Television and Concrete Engineering (1950–1999), and Contemporary Tower Engineering (2000–present). Each stop is a date, a name, and a short note — Stuttgart in 1956, Ostankino in 1967, the CN Tower in 1976, Canton Tower, Tokyo Skytree.
04
Thirty-two quizzes, the later ones locked
Every level holds four quizzes of eight to ten questions on its own ground: early purpose and materials, reservoirs and urban supply, mining headframes, iron and steel frames, radio masts, television towers, modern height and monitoring, then restoration and reuse. Easy, Medium, and Hard sit beside topic filters. A wrong answer still shows the historical note. Finish the four and the next level opens on its own.
05
Tower Explorer, and a reset that leaves the person
The profile opens as Tower Explorer until you rename it. Add a photo from the camera or library, or remove it. Pick a favorite: water towers, mining headframes, radio towers, television towers, steel observation towers, or industrial chimney towers. Stats count completed quizzes, current level, best quiz score, and articles read. Clear History returns progress to level one and wipes quiz results; name, photo, and favorite type stay.