Four Criminals and Black and White Hats Riddle

Four criminals are caught and are to be punished. The judge allowed them to be freed if they solve a puzzle. If they do not, they will be hung. They agreed. The 4 criminals are lined up on some steps (as shown in the picture). They are all facing in the same direction. A wall

Riddle: Old Man And His Three Sons

An old man had three sons. He was on his death bed and wanted to leave all his property with his wisest son. So he called all three of his sons and gave them equal amount of money. He told them to buy something from that money that can fill their living room entirely. The