From the main menu, load up Versus > Classic
Lives: 1 Life
Versus type: Free for All
Join with a second controller (you can do it with AI, but it is more difficult)
Select "Forsaken" > Glacial Pass
This level has 16 blocks of ice that can be broken quickly. When you break all of the ice, kill the other player and select "rematch." If you break all 16 blocks each time, you'll need to replay the level 62 more times to break 1000 blocks.