Im in Space... Awesome and memorable...
Back to the gameplay, The first time u play, U'll be take to the destructive building that destroyed by GlaDOS. And in the first time, u r unhanded and here they will give u a simple test. After u get portal gun, u can just shoot primary portal gun. Besides, they give u alternate Secondary gates that already installed in current places. Nah, this first test will make u to melt ur brain out, because no secondary gun, this test could be more difficult than after u have secondary gun.
Move along and Move along, There are Gel feature here, But dont worry, More feature they give, more easier ur brain must be used to solve this game puzzle, but I not said that all of those puzzle are easy, sometimes It difficult.
And the Final Boss, This is about Fast thinking and accuracy. They will give u time before the explosion executed. Ur mission is corrupting his core system. Kinda hard...
And My result, This game is awesome and entertaining. Yet u must test ur smart and purely with action shooting puzzle.