The big leak contains unreleased and pre-release content from Bungie-era Halo games from Halo CE up to Halo 3 and Reach.

Halo, Halo, Halo, what's all this then? 100GB of Halo content has leaked onto the internet, including a third-person demo.

Halo Studios, formerly known as 343 Industries, has become the latest gaming giant to fall victim to a significant leak, with nearly 25 years

After Insomniac Games, Rockstar, and the Pokemon Company were all hit by major leaks in recent years, Halo Studios has now fallen victim to a similar situation where almost 25 years of vaulted content from the shooter series has spilled onto the internet.

The team claims that Microsoft neither paid them for their efforts nor provided resources and it appears that someone else decided enough was enough so a massive amount of content is now out in the wild for the PC community to do with as it wishes.