Defeat Virus

Line up the drop, release the ball, and watch it ricochet through a petri dish of angry viruses.

So, you're staring at a petri dish crammed with smug little viruses, and all you've got is a handful of steel balls and a mouse cursor. Defeat Virus doesn't ask you to overthink it. Pick a spot at the top, click, and gravity does the rest. The ball drops, smacks into pegs and bumpers, and hopefully ploughs through a bunch of infected cells before rolling off the bottom. If you clear the screen, you move on. If not, you burn another ball and curse the physics engine. What keeps me coming back is the trial-and-error loop. Some levels look impossible until you notice that one angled bumper that can send your ball sideways into a cluster of three viruses. Other times you'll aim perfectly, hit one virus, and watch the ball bounce straight down a gap you didn't see. It's not always fair, and that's kind of the point. Each drop feels like a tiny gamble. You get a limited number of balls per level, so wasting one on a bad angle stings a little. The controls are dead simple: move your mouse to choose the drop position, click to release. There's no timer, no endless tutorial, no microtransactions nagging you. It's just you against the virus, one drop at a time. If you're stuck, don't be afraid to restart the level. Sometimes that first ball is a recon mission, and the second one does the dirty work.

Choose the location to drop the ball with the mouse.

Patience beats spam: watch how the first ball bounces before dropping the next one. Aim just left or right of center to exploit bounce angles that hit viruses on the sides. If a level has three or more viruses touching, try to hit the middle one with enough speed to chain all three. Don't waste balls on the same exact spot twice—the physics may be consistent, but your margin of error isn't. Use the bottom corners as escape routes; sometimes a ball that looks lost will bounce back up and clear a stubborn virus.

Q: Is Defeat Virus free to play? A: Yes, it's completely free in your browser—no hidden fees or payment walls. Q: Can I play Defeat Virus on my phone? A: Yes, the game works on mobile browsers and uses touch to pick the drop spot. Q: Do I need to download anything to play? A: No downloads required. Just open the page and start dropping balls. Q: Is Defeat Virus unblocked at school? A: This version is hosted on an unblocked games site, so it usually works on school networks. Q: How do I control the game? A: Move your mouse (or finger) to choose a position at the top, then click or tap to drop the ball. Q: What's the goal of Defeat Virus? A: Destroy all the viruses on each level using the limited number of balls you're given.