Can you count the number of lines in the below picture?

In the addition below, all digits have been replaced by letters.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?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Take one out and scratch my head, I am now black but once was red. What am I?

How many times can you subtract the number two from the number fifty?

Find the next number in the series.
1 10 24 43 67 ?

Can you find the hidden animal in the picture below?

Dr Doom invited a group of puzzle fanatics to a party which was oriented toward having puzzle-oriented games. At night, he introduced the guests to a 'unique riddle'. A prize was offered to the one who solved it first.

The guests included six people named Tom Paul, Fox Obama, Jeremy Reener, Alex Murphy, Prim Pastor, and Ellen Page. The winner of the 'unique riddle' contest was to be announced after the dinner. So Dr. Doom stood up and started the announcement:

'Okay now everybody!'
'The winner of�'
'The Hardest Riddle Ever Event'

But before he could complete it, the light went out and his voice was not heard without the mic by anyone. But they already knew who the winner was. Can you deduce the name of the winner?

Can you find the mistake in the below statement?

If it took eight men ten hours to build a wall, how long would it take four men to build it?