Cube

... a sci-fi story featuring some vaguely Hungarian high school kids trying to save their little sister from, um, not being a math / arts nerd anymore. Featuring: mysterious symbols, math camps, talking elevators, sneaking into shady corporate offices, StarCraft 2 (6 years before it became an actual thing!), cool 2004 era computer tech, "this definitely doesn't exist quite yet" computer tech, and somewhat odd parties.