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
