Here's one I just found though that can be used to make $$$ !!
Ok, so you know that once you finish a stage, there will likely be a bunch of secret races and such that you didn't get around to completing. You can check this out by going to the Garage, choosing World Map, then using the arrows to scroll through the various stages you've completed and the status of all races in those stages.
Being the perfectionist that I am, I've been religiously going back here and completing every race in a stage as soon as the stage is done. Yeh, I know, I'm a fruitcake.
This is all well and good - you can go straight to the race from the world map there, run it, win it, and return to the Garage to grab the next one. Quick and easy. Only one problem - you don't get any bloody money for winning.
However!! If you enter the race in this way, DON'T finish the race the first time around, and restart the race. The option to return to the Garage will be gone when you do actually win it, and you will win the cash!!
In my case, this is meaning up to 8000 smackers per race, and there's a whole bunch of em to do. Guess I stand to make a tidy little sum in the mop-up job eh?













