CliffyB's got your jump button right here
That's what he said and, in a recent interview with CVG, CliffyB elaborates on his original theory that Gears of War is more Bionic Commando than Mario. You are jumping ... just with a grappling hook ... and on a different plane. He explains, "In GoW you're essentially jumping but you're jumping on the X and Y axis. So you're leaping into the environment. If you were to look at a GoW battlefield from an overhead view, it would almost look like a Sonic or Mario level because that's how all the cover plays out."
That's a pretty novel way of looking at the game's construction. Though Cliffy does his best to appear otherwise, he often reveals a thoughtful side. Our favorite part of the interview: when he eschews the sentiment that a Hollywood adaptation means your game has made it. "I love movies but I believe I'm working in the most exciting sector of the entertainment industry." Oh snap! Take that movies! But he still offered up his candidate for the role of Marcus: Clive Owen. Really? He seems like he would need to put on about 150 ell-bees of muscle. And what's all this about Scarlett Johansson?