4x4 Hummer is an off-road driving simulation where players can test drive a range of General Motors' sports utility vehicles (SUVs) - including the titular Hummer series, Saab 9-7x SUV, Cadillac Escalade, Chevrolet Tahoe, Chevrolet Trailblazer GMC Envoy and GMC Yukon - across challenging and exciting locations including the Grand Canyon, Crimea, Egypt and Iceland to name a few. Players have full control over all the vehicle's 4x4 features such as the 4x4 gear box, GPS navigation, center differential locking, towing devices, height controls and tyre pressure as they challenge their driving skills across some of the world's most demanding terrain.