Lol. I'm thinking something like, Melee some giant blocks into place while under fire. Basically one or two guardians Melee while the other 4 defend. Mess up the slot for the block and a spider tank drops. Puzzle will shift each playthrough. Maybe you have to hold a relic of some kind to move the blocks. Easy puzzle to put together, but better than what we've got now. Or a coordinated fire puzzle. Six targets have to be destroyed in a certain order. The last target has to be destroyed two seconds after the first, meaning your fireteam has to coordinate who is shooting which target. Again, easy puzzle but it's something new. Or even like a classic door lock. Three pieces missing to a door. But picking up one key starts a timer. So you have to split into three groups and take down your enemies and pick up the keys as a team. There are a thousand different ways for Bungie to make this completely awesome. Also even more way to screw it up. I guess we can keep our fingers crossed.