Billion-dollar video game: is this the most expensive piece of entertainment ever made?

How much does it cost to make a video game? The development expenses of blockbuster games are closely guarded business secrets, but they have been climbing ever higher over the years towards big Hollywood-style spending. Industry leaks have exposed how the budgets of major video games are spiralling upwards: 100m, or 200m, even more. One of the bestselling franchises, Call of Duty, saw costs balloon to 700m ( 573m), a number only revealed recently when a reporter dug into court filings. There is, however, one game with a budget that is anything but secret.