You have to get lucky and trap your opponent in a situation where you can keep deflating him over and over. I've only been able to do it once.

 

There seems to be a lot of luck involved with the snowball blitz. High score depends on lucking into a lot of random shovels and stars. There's not much you can do if the game doesn't want to give you them.

No doubt, especially shovels.  I cant break 4,000.  I'm using a keyboard and trying to switch directions by pressing A + direction is really unresponsive, is it the same on a controller?
 

Yes. Even with the controller it can be annoying trying to switch directions. The controls aren't the best.


 

62,748 (13,270 + 10,831 + 16,717 + 21,930)



I cant believe it but I actually enjoy this game.  All the events.  I want to get better at Downhill Blitz.  The tube one I feel has a high point ceiling too. 

EDIT:  Score improvement

I still don't entirely understand how you're supposed to land when you do tricks in the half-pipe.


 

It might be superstition, but I click the A button when I land.  But really, if you are attempting a spin, you need to complete the spin or else you bail.  So I guess you need to pick up enough speed?  The spins are hard but they are the most lucrative, and if you dont do them, your bonus Trick score sucks...

I can sometimes pull off the spins where you press right or left and A. You can also do flips by pressing up and A when you're at full speed, but I've never been able to land them.
 

YYYYYEEEEESSSSSSSSS

That is an insane score for the innertubes event. You must have found an effective strat for constantly deflating the other guy's tube.
 

Yeah and I achieved it in the last half hour. You need to have the pocket knife cause it gives the most points. (750 a kill) And then basically stay in front of Lester and point yourself backward and just keep stabbing. You need to be able to do this on a straightaway with no moguls, since the moguls turn you around. You also have to avoid picking up and lesser weapons (fork and dart).

I also got the 1000 point bonus for winning the race.

Interesting. I didn't know that some weapons give more points than others.
 

Final leaderboard posted.