Hilly .io is another fun-addicting multiplayer online IO game to compete against lots of people from all over the world. As usual in race games, your goal is to reach the finish line in first place, but there’s a pretty interesting twist in this one. All you have to do is click to pull the ball down, what will make it accelerate when touching the ground. So try to use the hills to your advantage, landing on descending ground to gain speed and quickly releasing the ball when it’s about to jump up again. Collect diamonds on your way and unlock cool upgrades. Enjoy Hilly IO!