There are 3 shortcuts I've dicovered.here's one shortcut I've discovered. At the beginning go to the right while also flicking hte wiimote up. The next thing to do is, flick the wiimote up while also going to the right. Then, drop too the left. Then, flick the wiimote up again while also going straight. Land on the bouncy pad and you've finished the stage
When you have completed the stages in Rally-X Remix there will be 4 additional secret stages called 'Red Mode' to unlock. There is one in each world and they give you the option to play as the character that is trying to crash into Pac-Man.