Please try the following codes. ACLS:SPSET 0,759:SPOFS 0,50,100:SPSCALE 0,2,2:SPANIM 0,"I",15,756,15,757,15,758,15,759,0:SPANIM 0,"XY",-500,500,100:SPSTOP 0 @CONTROLS VSYNC 1:IF BUTTON(0)==#RIGHT THEN @RIGHT GOTO @CONTROLS @RIGHT SPSTART 0 @COW VSYNC 1:IF BUTTON(3)==#RIGHT THEN @STOPRIGHT GOTO @COW @STOPRIGHT SPSTOP 0 GOTO @CONTROLS