Infinite Energy
     Change Chao's name to 1234567.

Level Skip
     Get  a Chao from Sonic Adventure first. Then, when your Chao gets
to the end of an area it will ask you where you want to go. Select the
place you want to go and immediately press the mode button. Then press
the  mode  button  two  more  times  and  you will be back on the Chao
Adventure  screen. Just let the Chao start walking and it will let you
select the next area. You can repeat this as many times as you want.