PREP: DRAG to draw a defensive wall · TAP the field to place up to 3 auto-turrets.
Then START WAVE. Turrets fire automatically — keep the glowing enemies off your CORE for the full timer.
Glowing raiders pour down the lanes toward your CORE. In the PREP phase, drag to draw one short defensive wall and tap the field to drop up to three auto-firing turrets.
Hit START WAVE. Turrets fire on their own; your wall blocks and slows attackers but can be smashed. Survive the full wave timer and you advance — each wave brings more lanes, faster, tougher raiders.
If your CORE hits 0% it's over. Place turrets in front of the CORE and you'll clear wave 1.