First go on the game and go on start then slect profile ect then go on 1 player on wi-fi (only works 1 player) go on world wide(must be in UK) wait until u get 8-12
players minamum. (this only works with that many players) when unlocked bowser Jr and dry bowser and dry bones use any of those exept dry bones(dry bones needed and dry bowser and bowser Jr)now get either any bike or racer car.
now go try to go on mushroom cup first track (or any mushroom cup tracks, works better on first tho)now get a rubbish start and let the other people lap you then try to get in front and all you'll get is tripple mushrooms gold or bullet bill(or you can lap them it better for you to lap them but it harder) now save the triple mushrooms till first place and 1 lap in front then wen 3 spiney shells come (blue)use the mushrooms before blue shells hit you. then after you've done then hit a box on that track every time then you get triple mushrooms all the time but you have to go on same track then lap twice then you get on every track(only lap twice before you unlock triple mushroom on that track enjoy getting triple mushrooms its hard tho lapping people twice from around the world!
(p.s)(only them charcters work with triple mushrooms and only wi-fi works!)(dry bowser bowser JR and dry bones!) enjoy!!!!!