If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Join a competition where frozen mammoths race to be the first to reach the finish line.
Take a slipstream and jump over the other mammoths to try and lead the pack. Win the race to unlock new leagues to compete in.
Nothing can stop a frozen Mammoth when sliding down an icy slope, except another frozen Mammoth, so try to block your opponents as they jump over you!