This is truly a unicorn you're about to witness. Apparently, Microsoft wanted to make a Lego Halo game back in the day, but since Lego doesn't make guns they decided to release a line with rival Mega Bloks. You've probably seen the products in stores, and while they are impressive, they don't hold a candle to this impressive project!
Halo Mega Blocks was essentially Halo from a 3rd person perspective. It looks just like the Lego games...except there's guns and a Halo UI. It's actually super interesting!
While the project died a few years back...I wouldn't mind a resurrection! I seriously would see myself playing this game if it was made. What about you?