Fish Kingdom

Build the reef. Feed the school. Hold the line. Fish Kingdom: Aquarium Defense is a one-thumb aquarium-defense game where every fish you raise is also a little fighter — and every wave you survive makes the tank stranger. Drop food into the water and your fish eat, grow, and pay you back in coins. Spend those coins on more fish, stronger genes, and a bigger, busier reef. Then the swarm arrives. Enemies pour in from the edges: coin thieves, stunners, ambushers, and one towering boss every five waves. Your job is simple to say and hard to do — keep the Guardian Tower standing, wave after wave, for as long as you can. The tower is the run. It rises from the middle of every tank, it repairs itself a little after each cleared wave, and when it falls the run is over. Your final wave is your score. RAISE A LIVING REEF Every fish starts as a Hatchling and grows into a Juvenile, an Adult, then an Elder — bigger, worth more coins, and stronger in a fight. Fish have ten distinct personalities that change how they swim, feed, and flee, plus a chance to mutate golden for huge coin value. Feed them well and they thrive. Starve them and you will learn why aquarists worry. UNLOCK 64 SPECIES Thirteen fish are free from the start. The rest are unlocked permanently as you play, each with its own signature skill: damaging zaps, area novas, stuns, slows, venom, knockbacks, shields, healers, and coin-makers. Rare fish carry a RARE tag, and three ultra-rare species only appear once you have earned enough Prestige. FIGHT 147 ENEMIES AND 72 BOSSES From the first spiky brawler that lunges at your starter fish to the deep-water horrors that drag the whole tank toward their jaws, the roster keeps changing. Bosses telegraph their specials, drop shields, drain coins, call reinforcements, and enrage as they drop. Learn the tells or lose the tank. TRAVEL 19 THEMED TANKS Every ten waves, the entire aquarium reskins: new backdrop, new decorations, new enemy roster, new boss pool. Coral reef, sunken ruins, arctic water, neon depths, the abyss, and far stranger places beyond. Rings of escalating eras carry a single run into the hundreds of waves. BUILD YOUR DEFENSE Adopt helper pets — a pearl-spitting oyster, a stunning jellyfish mother, a laser shrimp that fights back, and self-cleaning plecos that heal, feed, and tidy the tank. Assign fish roles, place your defenders, and watch the utility-driven AI do the rest: your fish school, hunt, explore, panic, and recover moments before a boss hits the glass. PERMANENT PROGRESSION Spend Luster on 29 upgrade tracks — tower reinforcement and self-repair, fish vitality and combat power, economy, water quality, laser range and reload, coin magnet, offline earnings, and more. Then Rebirth: ten prestige levels, each unlocking new fish, new tracks, and a permanent power spike. There is always a next run that is meaningfully better than the last. A REASON TO COME BACK Daily Spin, Daily Quests, wave milestone chests, a 25-achievement bonus wall, a collection codex, weekly tournaments, and a refer-a-friend program. Share your best run as a card straight from the Game Over screen. BUILT FOR YOUR THUMB Landscape, touch-only, one finger. Every control is sized for a real fingertip. No keyboard, no mouse, no fiddly menus. Play for five minutes in a queue or an hour on the couch — boosts auto-claim, streaks keep through the day, and the tank keeps earning while you are away. Fair, unhurried, and generous: rewarded ads are always optional, offers are clearly labeled, and there is a one-time Remove Ads purchase if you would rather play without them. Adult and family-friendly, with no chat and no user-to-user content. Your kingdom is one wave from falling. How long can you keep it swimming?