Train Valley 2 lets you become a "railroad tycoon" by allowing you to build your railroad empire across the years, from the past into the future, and also solve some puzzles. It's available for free.

People on the internet love to challenge themselves with viral puzzles and brain teasers. In a new puzzle created by Heathrow Express, a series of 27 different trains all appear to be traveling west.

Only 2.5% of geniuses in the world can solve a simple picture puzzle like this one within 2 seconds. Can you beat the record of these puzzle masters and find the fault in this train image? What is ...