Much like the name suggests, there are 90 balls – each with a unique number between 1 and 90. Throughout the course of the game, balls will be drawn out and announced to the players. If the announced number is featured on your bingo card, you can cross it out. Once you have marked a certain amount of numbers, you win.
The 90-Ball Bingo card consists of a 3 columns and 9 rows, on a 3x9 grid. Each column contains 5 numbers and four empty squares. Only certain numbers can appear on each row, as follows:
When you mark off all 5 numbers in a single column.
When you mark off 5 numbers in two columns.
When you mark off all 15 numbers in a bingo card.