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Patents are about how you achieve a goal, not the goal itself. You can have multiple parents on “switching for character to vehicle on top down 2D environment” as long as the means to do so are not the same.
Sega had a patent on the transition between camera perspectives in a 3d racing game.
Everyone got around it being making the transition instantaneous.
In theory. In practice, software patents have pretty consistently been about the outcome and it’s held up in court. This expired patent on sanity systems, for example.