Planktoon

Your whole world shrinks to a single drop of water—and everything in it wants to eat you.

Planktoon drops you into the microscopic deep end as a speck of a critter with only one goal: don't become lunch. You steer with the mouse, gliding through murky blues and greens while larger shadowy shapes drift past. The tension is real because you're always the smallest thing on screen. There's a weird joy in darting between two bigger organisms and watching them collide instead of catching you. I kept coming back just to see how long I could survive on pure twitch reflexes. It's not a complicated game—no crafting trees, no dialogue—but that's exactly why it works. You learn the movement patterns of the bigger plankton quickly, and then you start toying with them. The soundtrack, if you can call it that, is mostly ambient bubbling, which makes the sudden lunge of a predator genuinely startling. What surprised me is how much personality a few pixels can have. Your little plankton wobbles when you stop moving, and if you hover near a food particle, it gets sucked in with a tiny pop. The only real strategy is positioning: stay near the edges of the swarm, never in the middle where ambushes happen. I found myself holding my breath during long strafes between safe zones. The difficulty ramps up slowly, adding more aggressive hunters and fewer hiding spots. It's the kind of game you open for five minutes and accidentally play for an hour. If you grew up on flash-era arcade games, this will feel like coming home. There's no story, no upgrade shop, no multiplayer—just you, the current, and a whole lot of hungry mouths. And honestly? That's enough. The mouse-only control keeps your left hand free to smack the desk when you die. Which will happen. A lot. But each run teaches you something new about the food chain, and that loop is dangerously addictive.

Use your mouse to play.

Stick to the outer edge of any group of bigger organisms—they tend to cluster and lunge toward the middle. Try not to move in straight lines for too long; predators lead their attacks, so zigzag when you sense something nearby. Small glowing particles are food and worth a quick detour, but only if you have a clear escape route back to open water. If a larger creature starts chasing you, swim toward another large creature—they'll often fight each other and leave you alone. Use the mouse gently; tiny twitches are better than big sweeping motions, especially in crowded areas. Pay attention to the water current indicator (if visible) and let it carry you when you need a speed boost without spending energy.

Q: Is Planktoon free to play? A: Yes, it's completely free in your browser with no paywalls or hidden purchases. Q: Do I need to download anything to play Planktoon? A: No downloads. The game runs directly in your web browser as HTML5. Q: Can I play Planktoon on mobile? A: Mouse controls are required, so mobile touch screens are not supported. Use a desktop or laptop. Q: What age group is Planktoon suitable for? A: It's kid-friendly with no violence beyond cartoonish eating, suitable for all ages. Q: How long does a typical game of Planktoon last? A: Runs usually last 1–3 minutes, but you can keep going until you get caught. Q: Does Planktoon have any unlockable content or levels? A: No levels or unlocks—it's a single endless survival mode focused on high scores.