Bob-omb Sudden Death
From the Super Mario Wiki
The game plays similarly to Sort or 'Splode. The players must drag the Bob-ombs and Bob-omb Buddies that are conveyed into the room to their respective, color-coded sides. Since it is color-coded, a Bob-omb must be placed in the black area, and Bob-omb Buddies the pink.
As opposed to two areas like in the single-player game, there are four in this game, two black and two pink. Each one has a number on it: a "5" for the two on top and a "10" for the two on the bottom. If the number of Bob-ombs printed on the section are placed there, then they are launched over to the opposing player's field.
If a Bob-omb or Bob-omb Buddy is placed in the incorrect section, then it, along with all other Bob-ombs on-screen, detonate. Additionally, a Bob-omb that remains on-screen without being placed in a section for so long also explodes. The player that causes either of these to happen loses.