Small soldiers. Big decisions.
Your fortress needs a plan.
Fortress Defense is a 3D strategy defense game about building an army and holding back incoming waves. Set your formation, decide where to spend your gold, and use fortress skills when the battle gets tough.
BUILD YOUR FORMATION
Combine eight base unit types, including infantry, heavy armor, armored cars, artillery, and support units. Put durable troops at the front and protect the units supporting them from behind.
CHOOSE YOUR UPGRADE PATH
Each unit type offers two promotion paths and can grow to stage three. Different choices turn the same starting units into different armies.
BALANCE INCOME AND SURVIVAL
Summon additional enemies to increase your income. Weigh the pressure you can handle now against the growth you want for the next round.
STRENGTHEN YOUR FORTRESS
Upgrade fortress health, attack, and defense, then spend mana on skills that support your army. Your worker's movement, placement, and skills are part of the plan too.
RECRUIT AND DEPLOY HEROES
Open chests for heroes and growth materials. Each regular draw independently awards a hero (10%), enhancement essence (20%), or choice hero shards (70%). Open a battle chest earned from a boss to randomly select one of your owned, undeployed heroes, then choose its position. If no eligible hero remains, the chest grants gold.
EARN A FAST-CLEAR BONUS
The round timer starts at first contact. Defeat enemies quickly for bonus gold; enemies gradually grow stronger when combat runs overtime.
FACE BOSSES. KEEP GOING.
Prepare for a boss every ten rounds. Continue beyond round 50 in endless play and work toward a new personal best.
LEARN, RETURN, AND TRY AGAIN
A hands-on tutorial teaches recruitment and hero placement. With a linked platform account and internet access, claim one random tutorial hero gift per account. If you skip before claiming, you can return to the tutorial later. Resume from progress saved when you clear a round. Meet unlock conditions to collect skins and change your army's appearance. Skins are cosmetic and do not increase stats.
Account connection is optional. Cloud saves work within the same platform and account; iOS requires iCloud sign-in. Guest progress is saved on the device.
Starting a new game uses energy. Energy replenishes at a set time each day. Optional rewarded ads can provide energy and selected skins. A completed speed-unlock ad enables 2x and 3x play for 6 hours, up to 4 unlock ads per day.
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