Alien. Defense

Alien. Defense drops you into the heart of an interstellar conflict. Hostile spacecraft descend from the heavens, and your only hope lies in a grid of defensive emplacements. Each round brings a new wave of bizarre extraterrestrial craft, demanding not just sharp reflexes but careful planning. You'll start with a modest arsenal, but as you repel each assault, you'll unlock access to more powerful weaponry, from rapid-fire turrets to devastating area-of-effect blasters. The battlefield is yours to shape: position your towers to create lethal crossfires and funnel the invaders into kill zones. This is more than a test of endurance; it's a puzzle of resource management. Every credit earned must be reinvested wisely. Upgrading an existing tower might be the key to breaking through a shielded enemy's defenses, while a strategic new placement could cover a blind spot. The alien forces adapt, throwing faster, tougher, and more unpredictable attackers at you. With each success, the difficulty ramps up, offering a true arcade challenge that's easy to pick up but hard to put down. How long can you hold the line?

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Alien. Defense

Common Core State Standards

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MP3Argue with math MP1Make sense of problems MP5Use tools strategically MP7Use structure 7.EE.A.1Rewrite linear expressions A.CED.A.4Rearrange formulas S.ID.C.8Correlation coefficient 7.SP.C.6Approximate probability G.GPE.A.2Equation of a parabola

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7th Grade · 8th Grade · High School

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What is Alien. Defense

Humanity's first line of defense rests in your hands. Alien. Defense is a thrilling arcade tower defense where every placement and upgrade counts.

How to Play

Select a tower from the build menu and place it on an available grid spot to target incoming enemies. Earn credits from defeated aliens, then reposition or upgrade your defenses to survive the next wave.

Tips for Playing

Prioritize placing towers in the center of the path to maximize their coverage.
Always save a bit of money for emergency upgrades between waves.
Focus fire on shielded enemies with a group of towers to break their defenses quickly.
Don't ignore cheap towers; a few well-placed basic turrets can outperform one expensive one.
Watch the path and anticipate chokepoints to build funneling kill zones.

Frequently Asked Questions

What is Alien. Defense?

Alien. Defense is an arcade tower defense game where you protect Earth from waves of alien invaders by building and upgrading defensive towers.

How do I earn credits?

You earn credits by defeating alien enemies. Each eliminated invader grants a certain amount of credits, which you can then spend on building or upgrading towers.

Can I move my towers after placing them?

Yes, you can usually move or sell towers between waves, allowing you to adapt your strategy as the enemy composition changes.

What types of aliens will I encounter?

You'll face a variety of alien ships, including fast scouts, heavily armored carriers, and shielded vessels that require special tactics to destroy.

Is there an end to the game?

The game features endless waves, with difficulty increasing progressively. The challenge is to survive as long as possible and achieve a high score.

Do I need to upgrade my towers?

Upgrading is essential for keeping pace with tougher enemies. Upgraded towers deal more damage and can gain special abilities that are crucial later on.