I remember the exact moment I was hooked on Red Faction: Armageddon. I was about 20 minutes into a four-hour preview session in which I got to sample different missions and cutscenes from the campaign when I first witnessed the raw power of ... pause ... the Magnet Gun.

It's a simple device: place a node on one object (that's the Attractor node) then place a node on another object (the Anchor node), then watch the Attractor node be drawn toward the Anchor node ... with violent enthusiasm. Among my favorite uses were to quickly bring down buildings (node on roof then node on base, watch it all implode on itself) or to drop large pieces of debris on aliens. You want to put nodes on two enemies? You've got a mean streak ... also, that'll earn you a "Martian dating service" Achievement.