Card Script - copy the following into your "Card" script:

local sGameRunning

on preOpenCard  
   set the acceleratedRendering of this stack to true  
end preOpenCard


on startGame  
   activateScreenUpdates  
   put true into sGameRunning
end startGame


on stopGame  
   put false into sGameRunning  
end stopGame


on updateScreen 
   if sGameRunning is true then     
      moveBox
      --      moveTerrain
      --      moveEnemy
      --      detectCollisions
      --      updateScore     
   end if  
end updateScreen


on moveBox
   if keysdown() = 65362 then
       set the top of the button "box" to the top of the button "box" - 4
       if the top of the button "box" < the top of the card "level1" then
          set the top of the button "box" to the top of the card "level1"
       end if
   end if
   if keysdown() = 65364 then
       set the bottom of the button "box" to the bottom of the button "box" + 4
       if the bottom of the button "box" > the bottom of the card "level1" then
          set the bottom of the button "box" to the bottom of the card "level1"
       end if
   end if
   if keysdown() = 65361 then
       set the left of the button "box" to the left of the button "box" - 4
       if the left of the button "box" < the left of the card "level1" then
          set the left of the button "box" to the left of the card "level1"
       end if
   end if
   if keysdown() = 65363 then
       set the right of the button "box" to the right  of the button "box" + 4
       if the right  of the button "box" > the right  of the card "level1" then
           set the right  of the button "box" to the right  of the card "level1"
       end if
   end if
end moveBox