It keeps something that cannot be kept,
And wakes you when you've slept.
It may go slow or stop at times,
But even then it chimes.
Answer: clock
Select a pack of riddles and try to solve it in an interesting way.
This riddle appears in the following downloadable PDF files:
Einstein said that only 2% of the world could solve this problem. Can you do it?
Complete the grid by using logic and the given clues of each problem.
Use logic deductions to solve problems that are similar to the Einstein's Riddle.