Dr. Terror’s Volcano Island is harder than normal Dr. Terror stages and starts at level 20.
Flank the enemy defenses and get your Warriors in position with carefully placed Flares.
Take out Cannons and Boom Cannons with Artillery and Barrage.
Without Smoke, Shock Bombs can keep your Warriors alive while they rush towards the HQ or destroy enemy defenses that are normally a problem.
A Medkit can go a long way to keeping your Warriors healed up once they reach the HQ.