You spawn objects and weld them together to create your own contraptions - whether that's a car, a rocket, a catapult or something that doesn't have a name yet - that's up to you. If you're not too great at construction - don't worry! You can place a variety of characters in silly positions. Garry's Mod also has integrated Steam Workshop mods, allowing for infinite creativity, diverse and exciting gamemodes and various playstyles.