The hardest game you've ever played? I believe quite some people would name the famous Rolly Vortex to be the hardest they've ever played. Though it has an extremely simple control and mechanic, Rolly Vortex is a tough test of your spatial perception, dynamic vision and reflexes. Control a ball to roll down an endless corridor (at a high speed) and dodge randomly moving walls & blocks. Any distraction could lead to a crash. It should be hard enough for anyone to reach a score of 80, while the highest score ever is said to be around 800).
Rolly Vortex accomplishes a very simple design but the 3D graphics could bring you an immersive sense of engagement. Here we offer an online version of Rolly Vortex for you. Try your hands on it and see how far you can go.

Rules and instructions:

Use your mouse or finger to move the ball along the barrel wall and dodge obstacles. Collect gems to unlock new skins.
For more running & dodging games, check out running games.