Originally posted by: missFiesty_69
Free slot ka matlab woh point free hai khaas aapke khatir.
Isse dekhlijiye.

No, seriously. I'll pick one diagonal here. Say if the host calls out 3,7,57,74, then you can cross them off and declare Bingo for that diagonal. Kyunki beech mein free hai. It means it's already called ( in bingo terms )
You can also do this for the 4,29,51,71 or the 15,23,58,69. You need only 4 numbers from the host to declare Bingo. This is basically done to make the game a little easier for the participants. (Ik it's unbelievable since it's Shreya's game but afaik this is how it is in Bingo
).
If there's no free, then here, for example, take 4,16,38,54,65 -- you need all the 5 numbers to be called out before you can declare Bingo. Agar ek bhi nahi hai toh you can't claim the row/diagonal/column.
I hope this makes it a bit clear.