Fifteen waves. One road. Don’t let them through.
Tap a grass tile to build a tower. Tap a tower to upgrade or sell it. Send the next wave when you’re ready; sending early pays a bonus.
Desktop: arrow keys or WASD move the cursor, Enter opens the build menu, 1–4 build, U upgrades, X sells, N sends the next wave, F speeds up. P or Esc pauses.
Your game is saved between waves.