What does this rebus riddle means ?

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

The more it dries, the wetter it becomes. Can you tell what it is?

Why is the Hole below a Lock?

Can you replace the question mark with the correct number?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

1 dollar = 100 cent
= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
= 1 cent

=> 1 dollar = 1 cent

solve this tricky problem?

Which tank will fill first?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?