What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

I can be cracked, made, told, and played. What am I?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.