Monster 4x4 features a lineup of customizable trucks to compete in 40 international off-road circuits. While a quick race option exists for each unlocked track, the main aspect of play is the Monster League Competition, which features a mix of events over the course of a season. After selecting a monster truck, each individually rated in such categories as speed, handling, stunts, and destruction, players can enter races filled with ramps and power-ups, challenge rivals in one-on-one duels, or engage in more traditional races. Causing destruction or performing tricks during events will earn players cash that can be used for vehicle upgrades and cosmetic enhancements. Split-screen multiplayer support is also available in four competitive mini-games, from the sport-based Monster Soccer to the destruction-oriented Monster Combat.