In bingo you work together with everybody at the pond to win the game by either getting 5 in a row (Classic Bingo), filling the 4 corners, getting both diagonals, getting both diagonals plus the middle row, or filling the whole card. Your group is given a card with random fish mixed on it, but not specific types. If there is a king crab on the card, any kind from regular to OKK will do. If there is more than one of that type on the card, you choose which one you want to fill. You also have a time limit. And, sometimes your card will have devil rays and/or wholy mackerals on it. You do NOT have to catch any of these. If you catch an old boot, it is a wildcard. You can fill in any of the spaces, preferably the ones taken up by the rarer fish, or the fish you cannot catch in that specific playground, and most preferably the spaces you need to win.
Hope that helps you