The top-left square is covered with black. Hit space to stop the wheel and reveal the top-left color. Try to put each color on the black square, and hit space to stop the wheel. If you are not using a keyboard, you can also touch (click) to stop the wheel.
++[>+++++<-]>[>++++<-]>[>++<-]>. >++++[>++<-]>[>+++<-]>[>+++<-]>+. ++. >++[>+++++<-]>[<<->>-]<<. +++. <<<<-. +++. >>>>---.
