Jelly Truck

Jelly Truck makes the truck itself squishy rather than just the terrain, the whole vehicle deforms and wobbles under its own momentum, so a landing that would be clean for a rigid car can bounce a jelly truck sideways off a platform it should have cleared easily.

Because the truck's body absorbs and rebounds impact rather than staying rigid, approaching jumps and slopes at a slightly reduced speed tends to keep it more stable than charging in at full throttle, the extra momentum amplifies the wobble in ways that are hard to correct mid-air. Letting the truck fully settle after a bounce before accelerating again usually prevents compounding one wobble into a worse one on the next obstacle. Jelly Mario applies that same unstable, jelly-like physics to platforming instead of driving.