Do hero or dark story mode until you unlock the cart racing gameperferably tails).then go to level select and click on the racing game.get a lot of rings on the level and repeat.every time if you get most of the rings are at least a garunteed 250 rings per visit(on tails level).repeat until you have enough to buy a rare chao egg,wool hat,or title theme.I'd say it would be better with tails because rouges level has many holes in the road that can be easy to fall through,costing you all the rings you got on the level and a life.Good luck!