GOBILLIONS

Gobillions is a tower defense game about building a fortress against an overwhelming goblin horde. Shape the battlefield with walls and towers, develop an arsenal of steel and sorcery, and keep your castle standing as the enemy tears your defenses apart.

Draw your own defenses. Place walls across the terrain and position towers to turn narrow passes into fields of fire.
Reinforce the line. Spend gold earned from defeated goblins on new towers, unit promotions, and stronger fortifications.
Plan for a breach. Build several lines of defense so one broken wall doesn't leave your castle exposed.

Branching tower upgrades. Start with Archers and Mages, then specialize into crossbowmen, artillery, and powerful spellcasters.
Research with Arcana. Unlock units, wall reinforcements, and Meteor Storm upgrades through a shared research tree.
Make permanent choices. Each tower follows its own promotion path. Combine long-range fire, piercing attacks, and crowd control to cover one another's weaknesses.

Hold back the horde. Concentrate your fire on packed ranks of goblins as they push through the mountain passes.
Cast Meteor Storm. Spend Mana to strike a dangerous concentration of enemies, then develop the spell through further research.
Adapt as walls fall. Towers topple, masonry crushes enemies below, and new gaps open in your defenses. If your castle falls, the defense is over.