For example, 1 stunt I used frequently involved setting up a portal somewhere high above me on a wall. Then I’d jump off a cliff, start falling — and then open a portal precisely at the spot where I was due to hit the ground. My momentum would blast me out the portal high above the ground, shooting me like a bullet through the air to a far-off ledge I couldn’t otherwise reach. The game constantly challenges you to invent ever more paradoxical feats of self-propulsion. I used the same momentum-gathering technique to bounce myself vertically upward out of a hole in the ground, and then, while flying through the air, shoot another portal in a nearby piece of ground.

about time that games seriously explore alternate realities with alternate physics

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