Doors can have their lock checked with the melee key. You can now aim down the sights, and there are now traps to disarm. The gameplay itself has been drastically changed. Even after you've completed the campaign, there's various flavors of permadeath to tackle.if you think you're Elite enough. If that isn't what you'd prefer, there's also an All Missions campaign which allows you to play through any mission, including custom ones on the hard drive, with any equipment in the game, including some which is multiplayer sepcific. The main campaign, a combination of the vanilla game and The Stetchkov Syndicate, has a carefully crafted unlock system that you can play through with a friend to complete. The broken AI is fixed, cut content has been restored, and every weapon is precisely calibrated to its real world counterpart. The best way to explain SWAT: Elite Force in short is a complete overhaul of the original game. I've spent countless hours playing the game, mostly in CO-OP on servers new and old, and there always seemed to be a glimmer of potential that has never been truly realized by games that followed it. SWAT 4 is a fantastic, if horrendously bugged product.