Frontier Crossroads
Build a town on the Platte River, 1846–1890, and decide real history events from many viewpoints.
Free preview: 1846–1854 (stops when the calendar reaches 1855).
Interactive history lessons for grades 6–8
Students learn U.S. history by doing it: set the type for the Declaration, stack the powers of government, lead the Corps of Discovery up the Missouri. Built for middle school classrooms and Chromebooks.
No student accounts
Students open a class link from Google Classroom and start. No logins, emails or passwords.
Runs on school Chromebooks
Everything loads from this one site in the browser. Nothing to install, no ads, no trackers.
Made for social studies class
Each lesson covers a topic in the grades 6–8 U.S. history sequence, plus two world geography challenges.
Nine interactive lessons
Every lesson has a free preview. A Classroom Pass unlocks the full versions for your whole class.
Checks & Balances Tower
A physics stacking game: drop each constitutional power on the branch that holds it, then use real checks (vetoes, judicial review, impeachment) to keep the tower standing.
Free preview: Chapter 1, 3 levels.
Corps of Discovery
An action-strategy campaign along the Lewis and Clark route: pole the Missouri, stalk bison downwind, trade at Fort Mandan and more.
Free preview: Stages 1–4, through the Fort Mandan winter.
How it works
- Try a preview. Any lesson can be played free for 5 minutes, so you can see it before your class does.
- Get a Classroom Pass. One $10 pass gives you a class code that unlocks all nine full lessons. Coming soon
- Post one link. Share
keystonelessons.org/play?class=YOURCODEin Google Classroom. Students click it and play.