A properly timed mushroom/boost may get you out of the blast radius.
gaming.stackexchange.com/users/336/Raven Dreamer
If you're in 1st, hit the brakes hard whenever you hear the sound of a blue shell from anywhere.
If you're lucky, you'll slow down enough to let someone pass you in time, at which point you simply need to keep a short distance between yourself and the new 1st placer until they get pwned by the shell.
Try to keep out of their blast radius.
gaming.stackexchange.com/users/1777/Keaanu
I've had one where it zoomed at me just as I started up a small hill/bump, the shell missed me due to my upward movement and it instead went through the ground.
The funny part is that the shell was still visible going off into the "distance" beneath the ground.
gaming.stackexchange.com/users/1619/weiji
It's very difficult to do, but if you start up a slide-boost when you hear a blue shell coming, you can activate the boost just before the shell hits.
As I stated though, it's quite difficult to do, and I've only ever avoided probably a few dozen shells this way.
gaming.stackexchange.com/users/3114/GnomeSlice
I too dabble in the MKDD and have avoided countless red shells.
For blue shells it is the same principle; just a smaller window of opportunity.
When you hear it coming, go into a drift and achieve the blue flames.
Before it comes down on top of you, release the drift and boost forward so that the shell hits the ground behind you or just flies past you off the map.
I've been able to do it many times, it's just a guessing game on when the shell is going to hit you.
gaming.stackexchange.com/users/176660/Evan Pugh
Use mini-turbo strat that Evan Pugh says, that is very common.
Use mushroom at correct time.
Use a boost panel like the one in Wario Colosseum and ram into the wall.
Drop out( fall out of the map)
Cannon(enter
when the blue shell is behind you)
I hope this helps.
gaming.stackexchange.com/users/241202/Andrew Weng
My friends are intense MKDD gamers and we are very dirty when we play. Because of this we have been able to dodge red shells easily. I want to take it to next level, I want to dodge blue shell. I know this is possible because we have did it I just do not know the solid technique to get it.
How to dodge the blue shell in Mario Kart Double Dash
gaming.stackexchange.com
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gaming.stackexchange.com/questions/1771
gaming.stackexchange.com/users/505/phwd
Try a properly timed mushroom boost or hit the brakes or go into a drift when you hear a blue shell. You can also try a mini turbo strat or drop out. This is a difficult move, however using a mushroom or boost at the right moment might work, as might hitting the breaks quickly, or getting a slide boost and releasing it at the right moment with a boost, also called the mini-turbo strat, may be a boost panel might work, or dropping out of the map.
A number of different strategies are recommended in order to carry out this difficult move.