Aggressive Inline is a sports video game for GameCube that blends inline skating with gameplay mechanics similar to skateboarding games. Players progress through a career mode by completing objectives, such as executing specific tricks to earn points and unlock seven distinct arenas. The game features a park editor for creating custom environments and employs a juice meter mechanic to manage gameplay duration. Character progression occurs through a skill development system that enhances attributes like speed and grind proficiency based on in-game performance. Each level contains five hidden keys to access new areas.
Combine the many tricks and styles of the extreme sport, inline skating, with a Tony Hawk style system, complete with objectives and huge arenas, and you have Aggressive Inline.
Progress through the career mode, where you must complete objectives (such as grind a certain object(s) to jump over large gaps and gain points) to open up further arenas, which there are 7 in all, and once your bored with them, you can make your own in the park editor. The game doesn't use a hard time limit but the so-called `juice meter`: it fills up when performing stunts and if it gets empty, the level ends. During the game you level up your character in seven stats, e.g. speed and grinds. The game uses a `learning by doing` approach to this, meaning that the stat improves if you perform the associated actions often enough. There are also five hidden keys in each level which open up new areas within the level.