You can pick up items such as stars by skating over them.

Collecting stars fills your star meter, which increases your speed and stamina and helps you resist attacks. If your star meter is completely empty, you may be knocked to the ground by an opponent.

Getting hit by opponents will knock out some of your stars -- and once they're gone, they're gone for good.

If your star meter is completely full, simultaneously pressing the B Button and Z Button will activate a powerful forward charge move. This sacrifices half your stars, but is useful for getting through the pack or taking out a rival jammer.

The opposing jammer will be collecting stars too. Both your star meters will empty out after a jam.