Iron Defense

Play Iron Defense unblocked

Play Iron Defense online for free on Physics Shark. This tower defense game runs in a normal browser tab, so there's nothing to download and no sign-up, and it works on a school Chromebook, a laptop, a phone or a tablet.

What is Iron Defense?

Iron Defense is a one-screen defense shooter set in an industrial scrapyard. Hold a turret on a scrap wall while waves of junk robots march in from the right. Hold to fire, and drag fire, ice and lightning abilities onto the field. Between stages, spend salvaged gold and crystals on your turret, the wall, an electrified floor and auto-gun pylons. Fight through a 100-stage campaign with bosses, then climb the endless stages to see how far a fully upgraded defense can hold.

How to play Iron Defense

Hold the mouse button or your finger on the field to fire at the robots. Drag the fire, ice or lightning button onto the field and release to cast it; release on a button to cancel. Abilities use energy, which refills over time, and the + button refills it for crystals. Win a stage by destroying every wave before the wall falls. Spend gold and crystals in UPGRADES between stages. Clear stage 100 to unlock Endless.

Iron Defense FAQ

Is Iron Defense free to play?

Yes. Iron Defense is free on Physics Shark, with nothing to download and no account to make.

Can I play Iron Defense unblocked at school?

Iron Defense runs in a normal browser tab with no install, so it plays on school Chromebooks and laptops, with nothing to install and no account.

Does Iron Defense work on phones and tablets?

Yes. It works with touch controls on phones and tablets, and with a keyboard and mouse on computers.