Portal

About Portal

Portal is a physics-based arcade game where you control a small ball that must reach a safe zone on each level. A black hole sits somewhere in the level, constantly pulling the ball toward it with its gravity. You must drag the ball with your mouse or finger to move it, counteracting that pull just enough to stay on course. The ball obeys realistic momentum, so quick, sharp movements can send it careening into danger.

The challenge lies in navigating around obstacles and finding routes that keep you far from the black hole's event horizon. As levels progress, the black hole may move, change size, or multiple holes appear, forcing you to think ahead and manage your speed. A single misjudged drag can send the ball spiraling into the void, ending the run. Precision and patience are key to clearing each stage.

Tips to win

• Use obstacles as shields to block the black hole's gravitational pull temporarily.
• Plan your route to pass as far from the black hole as possible; gravity weakens with distance.
• Avoid direct fights against the pull; move tangentially to orbit around the hole and escape its grasp.