This game actually come with 3 different games that allow 4 kids to play at a time. The kids take turns passing around the popper. The dice inside the poppers have different letters on them.
After the kids get a letter on their popper, they have to find a word that starts with that letter on their bingo board. They put their bingo chip on and continue playing that way until someone fills their board with tokens.
This game wouldn't be too hard to make on your own as well if you have letter dice the kids can roll. I have seen some people who put their dice inside a small container for kids to shake to avoid rolling all over the floor!