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For those who are a trifle confused, basically it's the mass and density rather than volume (size) that contributes to gravity.
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I was a confused trifle, because Jupiter is a gas giant and Oddworld is a terrestrial planet, it seems fair to assume Oddworld has a similar density to the terrestrial planets in our solar system.
Also volume (size) does contribute to gravity's effect as BM said, the bigger the planet, the further you are (on the surface) from the center of gravity