Meet the Robinsons

I found the easiest way for me was to play them on the training level. The blocks are all a straight shot and you only need to win one round instead of best of three.

The easiest thing to do is to go through the campaign and get all the upgrades for the charge glove. Once you have them go into the mini games and play all characters on the veteran court. With the upgrades the blocks drop in one shot, as opposed to 2 without the upgrades.