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Portal Basics: Controls, Elements, and Tips.
Feeling lost, forgot what a control was, or have a question on a function in the game? Then, read this guide!
1500 Megawatt Aperture Science Heavy Duty Super-Colliding Super Button
Stand on it, or place a cube to activate things. Cubes
Emancipation Grills These destroy all portals that you have previously placed if you try to go through one, and will also prevent you from placing portals. These will also destroy movable items that go through it. (Including cubes, turrets, etc.)
Danger Goo These are just bodies of water that you can't go into. Avoid falling into it!
Glass walls Allows you to see what's on the other side, but doesn't allow you to place portals.
Although it has a soothing voice, it doesn't like you, and will shoot you to death. Kill them by knocking them over, or frying them through an emancipation grills.
Missile Turret Launches missiles at you. You can easily dodge the missiles. The missiles can be used to destroy things.
High Energy Pellet, Catcher, and Launcher
Although the Energy Pellet can kill you instantly, in certain levels, you are required to direct it to it's catcher to activate things. It spawns from the launcher.