Teachers can use these questions to draw students out and get worthwhile formative assessment responses to guide instruction.

This testchamber gives you another chance to play with momentum jumps. Place a blue portal on the wall panel that's jutting out overhead. Look below for the floor of a pit where you should launch an ...

Right away you spot a red floor switch as the testchamber branches both left and right. For now, go left up the stairs (the stairs later recede into the floor, forming a pit). At the top of the stairs ...

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