It seems that Master Chief almost ended up blasting Covenant made of Mega Bloks. After showing the Diddy Kong racing sequel that never was and a scrapped sequel to Oni, archivist Andrew Borman is now reporting on the prototype for Mega Bloks Halo in a new video on his YouTube channel.

Borman reports that the prototype, codenamed ‘Haggar’, was developed by nSpace. Players could run around to fight Covenant, drive customizable vehicles, and use bloks to build turrets and other pieces of the environment. The project would have also featured a co-op mode and a siege mode.

The full development history of the project is unclear given its highly confidential nature but Borman speculates that the 360 title was abandoned as Microsoft made plans for the launch of the Xbox One. You can learn more by watching the video above.

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Update—Jan 9th, 2:50 p.m.: The founder of 343 Industries, Bonnie Ross took to the forums at Halo Waypoint to talk about the project. Their statement reads as follows:

Over the past few days, footage has recently made the rounds of an exploratory Xbox 360 project we worked on several years ago, known as “Haggar.” Since then, we’ve received a lot of great feedback from the community. Haggar was something we prototyped with our friends at Mega Bloks that focused on the elements of action, exploration and user creativity found within the Halo universe. Haggar had a lot of fun ideas and invention behind it, but ultimately didn’t progress beyond the early prototyping levels that are shown in the recent video. This is just one example of several similar projects we have evaluated throughout the years – a process that we continue exploring on an ongoing basis.