Pick one roster for the whole match — you can't switch once it starts.
Your lane (left) vs the computer (right).Build a wall on the first arm (tanks front, DPS behind), matching your damage type to the wave's armor (piercing→light, normal→armored, magic→boss). Leaks run to your King — hold it; bosses (every 10th wave) melt the wall and chip the King, which heals only slowly. Send creeps for income + pressure (sent units show an amber ▾ ring); Infuse/Upgrade harden the King. Win by surviving 30 waves or dropping the computer's King. Full detail: docs/ENCYCLOPEDIA.md.