In “The Maze Runner,” the ratio of vocabulary to explanations is alarmingly high. The main setting is the Glade, where a “Greenie,” or newcomer, arrives each month with supplies for a platoon of lost boys. The Glade is surrounded by a giant maze monitored by “Grievers,” monsters that have features of spiders, scorpions and robots. During the day, “Runners” map the maze, but moviegoers may feel as if they were the ones being tested.