Crystal Tower Defense

Crystal Tower Defense is a tower defense game in which you build a labyrinth of turrets and walls to stop crystal-type enemies from reaching a portal to Earth. Enemies follow the path you create, while randomly generated obstacles shape the map in each run. You can sell obstacles to open new routes, then rearrange your labyrinth to make better use of your turrets.

Defend the portal

Enemies grow stronger the longer you defend the portal. Destroying them earns gold, which you can spend during a run to upgrade each turret’s range, damage and reload time. You can also use six abilities to support your turrets.

As you progress through the stages, you can unlock 10 turrets. Enemies may drop crystals, the main currency for unlocking and permanently upgrading turrets. Completing a stage also rewards you with a big crystal containing permanent turret upgrades, which you can equip in the armory.

Stage rewards

You receive one big crystal after each stage, but must end your run manually to claim your gathered rewards. If you run out of lives, you lose them. Rewards improve with the highest stage you clear, and the menu shows the drop chance for each rarity per stage.

Forge upgrades

The forge lets you merge upgrades for larger bonuses. Combining upgrades always improves the bonus, and combining multiple of the same type determines the result type. Upgrade types include range, damage, reload time, cost reduction, armor damage and shield damage.