Build & Destroy is a really fun multiplayer browser game in which you can stack up your skills as a builder and a shooter against players from all over the world.
The premise of Build and Destroy is that you are a mushroom thingy that is trying to build a tower that will lite a firework floating in the air on a balloon. As with many multiplayer games, your opponent is trying to do the same. The trick is that you have to tactically shoot down his tower and build yours at the same time. But don't worry, this little online game is turn based, so you don't have to hurry with your build.
As far as browser based free online multiplayer games go Build & Destroy is pretty cool and fun and you usually don't have to wait too long to find an opponent.
Try playing Build & Destroy!