The rumour mill has struck again.

This time it is claiming that 343 Industries' Halo Infinite is currently the biggest and most expensive game in development.

Source: Xbox

According to Digital Trends, the project's budget is well over $500 million dollars. And that doesn't even include marketing costs!

That's right, the next instalment of the Halo series is allegedly splurging half a billion dollars on just development costs!

Source: Giphy

The report comes from the German outlet, Xbox Dynasty where it claimed that Halo Infinite's development costs currently dwarf even the likes of Rockstar Games' Red Dead Redemption 2 and Grand Theft Auto V.

Source: Forbes

If the rumours are anything to be believed, then it's going to be one heck of a game.