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The gravity of Oddworld is not 10x Earth. We've never had any real clarification about Oddworld's actual size, but to put it into perspective, try calculating your weight on the surface of Jupiter (or the force your jetpack would need to hold you up). Jupiter is 318 times as massive as Earth, so if it was the same size as Earth you'd weigh 318 times as much. But Jupiter is much larger than Earth.
The force of gravity pulls you towards the centre of gravity of any body. A planet is massive enough for gravity to force it to collapse into a sphere around the centre of gravity (excepting the effects of centripetal force and the minor deviations of local topography), so the centre of gravity is also the centre of the planet (a location in which, were it hollowed out, and the weight of the planet held back around it, you would be weightless). So the distance of the surface from gravity's centre is the planet's radius.
Jupiter's radius is 11 times that of Earth, and as you know from Newton's inverse-square law, this means you are 11² times lighter (121) on the surface of actual Jupiter than on the surface of an Earth-sized Jupiter. 318/121 = 2.53. So on the surface of Jupiter, you are 2.53 times as heavy as you are on Earth. I've experienced worse on fairground rides, though admittedly only for short periods.
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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.