If you're looking to get your brain whirring again after some days of celebration over the festive period, these riddles and brainteasers might be just for you. But, warning: they are not easy!

Brainteasers and riddles are an exciting way to test your intelligence levels and mental sharpness. Experts believe that solving them is an exercise for your brain muscles and puts all your skills to the test.

Here's five tough tasks that will put your mind to work — scroll down to the bottom of this article for the answers. Good luck!

Riddle 1: What is seen in the middle of March and April but can’t be seen at the start or end of either month?

Riddle 2: A murderer is condemned to death. He has to choose between three rooms. The first is full of raging fires. The second filled with assassins with loaded guns. And the third full of lions who haven’t eaten for a year. What room is the safest?

Riddle 3: Can you figure out what comes next? (See below).

Riddle 4: What rock group has four men that don’t sing?

Riddle 5: How many squares can you find in this picture? (See below).

We told you they were tough! How many do you think you got right?

If you're ready for the answers, scroll down to find out how you got on.

Answers:

Riddle 1: The letter ‘R’.

Riddle 2: The lions because they would have died of starvation.

Riddle 3: 312211. Here’s how it works: Take the last number, 111221, and describe it out loud. You have three 1s, two 2s, and one 1. Writing that down gives 312211.

Riddle 4: Mount Rushmore.

Riddle 5: Eleven squares (see below).

Sources: Riddle 1 from Reader's Digest, Riddle 2 and 3 from Bored Panda and Riddle 5 from Bright Side.