There are all different levels of brain teasers, brain games, riddles, and the like out there on the internet. You start slow (because we all want to feel like we can solve them all) and slowly raise you game – like how the crossword puzzle gets harder every day of the week.

If you’re ready for some really tough brain teasers, we think these 13 totally deliver.

13. Bacon or Eggs?

Answer: Gwen likes foods that are five letters long.

12. Mary Must be Friends with Silly Sally

Answer: Mary’s friends prefer fruits with names that end with vowels.

11. A Tough One

Answer:

10. You Think You Can Do Math…

Answer:

9. What Time Is It?

Answer: Yes, between 5 and 5:30 p.m. EST.

8. Getting Into Shape

Answer: 200 push-ups.

7. A Mystery Diagram

Answer: 

6. Square Checkers

Answer: Six groupings.

5. The Sum of Letters

Answer: A = 13, B = 5, C = 17, D = 8, E = 2, F = 4, G = 3, H = 12.

4. Rearrange the Shapes

Answer:

3. One Doesn’t Fit

Answer: B

2. Take the Stairs

Answer: 840. Each number is found by multiplying the number that corresponds to its step by the number that precedes it.

1. How Many Times?

Answer: Twenty times. The digit 5 appears ten times as a last digit (5, 15, 25 … 95) and ten times as a first digit (50, 51, 52 … 59). 

I definitely couldn’t have solved all of these on my own.

If you solved them all, give yourself a big pat on the back (and maybe a cookie)!