def build(self): self.progress=self.load_progress() self.grid_screen=LevelChooser() self.grid_screen.bind(on_level=self.level_choice) self.grid_screen.bind(on_wtf=self.wtf) self.grid_screen.color_progress(self.progress) self.level_screen=Level() self.wtf_screen=Help() self.level_screen.bind(on_pass=self.success) self.root=ScreenManager() self.root.add_widget(self.grid_screen) self.root.add_widget(self.level_screen) self.root.add_widget(self.wtf_screen) self.bind(on_start = self.post_build_init) return self.root