Opening animation
At the beginning of this game, a hydraulic press smashes the ground and when it goes back up, the player appears. This animation had to be implemented through Unreal and had to move smoothly into the game without a noticable transition from animation to game. On the right you can see the result of this.
Spline movement
During the game, the player can move the cart left and right, but the overall movement is just an offset on the main spline. This allowed us to make the level go sideways, up and down, and have hard turns all around. The end result can be seen partly in the gif on the right, but mostly in the trailer linked above.