Ben 10 Galactic Racing

One way to get a bump is to hit them during a jump( or land on them earning you the "Absolutely Smashing" achievement) but the easier way is to stay in last place until you get the ultimate attack that looks like the Omnitrix wait until you can see someone then press A to use it. It will give you a huge speed boost and take all the turns for you just control it enough to try and hit as many people as possible(you will know if you get a bump if they are blinking). Elite Scion XB added that if you ram someone with your Defensive Power activated and it wipes them out and makes them blink this also counts as a bump.

Try to use it right behind the guy in 7th place because the closer you are to the front of the group the less time the powerup will last. Don't get discouraged if you don't get one on the first lap sometimes it's a lot harder to get on the first lap and stay close to 7th place because it won't give it to you till you are far enough away from first place.

I chose one of the last levels so there would be more powerups and more time. The character I chose was Vilgax with a heavy kart but if you have the "Plasma Tank" kart unlocked I would use it. You can check how many bumps you have by going to "Extras" then "Achievements".

If you don't already have the "Not Even a Scratch" achievement for blocking 100 attacks with your Defensive Power I would recommend working on it at the same time. Whenever you have the defensive power an run across a trap use it and run through the trap this will save a lot of time. If you want more details see my guide for that achievement.

My 7 year old son discovered an easy way to get these and managed his last 45 in 30 minutes before going in the bath on a school night!!! lol

Simply build up your defence by drifting then activate it while in traffic and knock them down like skittles.

All Hail Son Of Smoke.