I did this myself and actually got 999 lives.To get 999 lives go to Star World and go to the one where there is the Yellow Yoshi and Lakitu(guy on the cloud).DO NOT get the Yoshi.After Lakitu throws like 6 spike guys press the button. Dont get them but slowly they'll go to the ekit pole thing.When about 5 of the coins get on the screen when ur out the pole go through.You'll get 15 lives or i think 20.Do this repeatedly and u will get 999 lives like me!