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Is the quote really appropriate? That bit in Portal doesn't really herald a gameplay change. It's still a puzzle like any of the other levels. Then again, from an in-world standpoint, it does herald a change from just ambling around to dodging live gunfire, so you could say it's appropriate, on the other hand.
So the MAKO vehicle and the hovercraft in the Mass Effect series aren't unexpected gameplay changes I guess? Just the taxi ride in the Shadow Broker plot line? Just trying to get a handle on this.
Very Late Reply, but:
If the Mako only appeared in one instance, and then never again, it would be considered an UGC. But you get the Mako on every planet except the first one. So it would not be considered a UGC as it's currently defined.
The Hovercraft (actually called the Hammerhead) could be considered a UGC, but you're still flying around and shooting/collecting things, so it's more considered an upgraded version of the Mako.
What makes the Taxi Ride a UGC is the fact that you're in a vehicle with no weapons and the game is operating under "chase scene rules" instead of "kill the enemy" rules.
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How well does it match the trope?