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A bullet-heaven where every run feeds incremental permanent upgrades. Defend your fortress, harvest crystals, and climb a 500+ node tech tree until your scrappy defenses become a screen-clearing arsenal against absurd swarms.
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Fortress Full Fury
SteamAbout Fortress Full Fury
YOU ARE THE FORTRESS
Pick and upgrade the right perks to help the tower survive. Lower your weapons whenever you can to collect crystals and scrap to level up. Aim and shoot manually for additional firepower.
LOSE THE RUN. WIN THE WAR.
Spend your hard earned crystals on hundreds of meaningful upgrades that unlock more and more perks for you to choose during your run.
EXPECT THE ABSURD
WHALE.
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Unlock more than 25 weapons and perks with multiple levels across a massive 500+ node tech tree
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Encounter unique random events that keep your enemies on their toes
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8 stages plus a late game escalation mode for an ever-increasing infinite challenge
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
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