I need a solid sprite

[flopping]

Hello, I need the code to make a solid sprite, for example a box, that is pushable and stackable with others, for example, to be able to climb on top of them and reach higher places, I have this code that is generated by default the MPAGD itself:

IF COLLISION PLAYER
LET Q = X
LET U = Y
OTHER
LET V = X
LET W = Y
ENDSPRITE
IF V > Q
SUBTRACT Q FROM V
LET Q = V
LET R = LEFT
ELSE
SUBTRACT V FROM Q
LET R = RIGHT
ENDIF
IF W > U
SUBTRACT U FROM W
LET U = W
LET P = UP
ELSE
SUBTRACT W FROM U
LET P = DOWN
ENDIF
IF Q > U
IF R = LEFT
IF CANGOLEFT
SPRITELEFT
ELSE
OTHER
SPRITERIGHT
ENDSPRITE
ENDIF
ELSE
IF CANGORIGHT
SPRITERIGHT
ELSE
OTHER
SPRITELEFT
ENDSPRITE
ENDIF
ENDIF
ELSE
LET R = P
IF R = UP
IF CANGOUP
SPRITEUP
ELSE
OTHER
SPRITEDOWN
ENDSPRITE
ENDIF
ELSE
IF CANGODOWN
SPRITEDOWN
ELSE
OTHER
SPRITEUP
ENDSPRITE
ENDIF
ENDIF
ENDIF
IF COLLISION TYPE
UNDOSPRITEMOVE
IF COLLISION PLAYER
OTHER
IF R = LEFT
SPRITERIGHT
ENDIF
IF R = RIGHT
SPRITELEFT
ENDIF
IF R = UP
SPRITEDOWN
ENDIF
IF R = DOWN
SPRITEUP
ENDIF
ENDSPRITE
ENDIF
ENDIF
ENDIF

but this sprite is only pushable, not stackable and if I climb on top of it, I fall inside, so it's not worth it, can someone help me to modify it or give me some other code that can do what I want? thank you very much.