Which is the rope you never skip with?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Can you place six X (crosses) in below board without making three in a row in any way ?

Rearrange the letters in "new door" to make one word.

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

What breaks yet never falls, and what falls yet never breaks?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

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

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?