Secret Coders Vol. 6 Monsters & Modules (comics)

The Coders always knew their programming skills would take them far, but they never guessed they would take them to another dimension-- or to be accurate, one dimension less. To save humanity, Hopper, Eni, and Josh must travel to Flatland, a dangerous two-dimensional world ruled by polygons. If they can return home safely with a Turtle of Light, they might just stand a chance in their final showdown with Dr. One-Zero