Cornerstone · Free desktop beta · Middle-school math
Build a town.
Make the numbers work.
Lay the roads. Bring in families and jobs. Keep the lights on. Every choice changes your town—and its books.
The town is the math
Income tax, wages, upkeep and growth all appear in the City Books. See the arithmetic behind a monthly budget, then decide what to build next.
Learn by building
Learn to Play guides your first town through roads, homes, power, water and jobs. Move back through the tutorial when you need another look.
Keep your city
Use the same MFHS nickname to continue your cities and tutorial on another device. Cloud conflicts keep a recovery copy so you can choose your next step.
A parent sets the foundation
Sign in with your own email, read and confirm Cornerstone’s parent notice, then create an invented game nickname. Children do not need an email account. Each nickname keeps separate cities.
Keyboard and mouse are recommended for this beta. Touch controls are available, but physical-phone gameplay has not been fully verified. The game is still growing; keep occasional recovery downloads of towns you want to keep.