A simple demo game, using netfox's RollbackSynchronizer to demonstrate input
prediction.
Players control marbles, that behave somewhat similar to cars - they can change direction, but gradually, and never on the spot. They can also speed up or slow down, but only gradually.
This lends them well to input decay - when there's no input available, the game assumes that the player is slowly letting go of the gas. This is a more accurate prediction than assuming that the marble stops immediately, thus resulting in less noticeable glitches with bad network conditions.