GM Block Tutorial

Create Event:
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image_speed = 0.1
ready = 0
ready2 = 0
//This will make the block solid.
    mysolid = instance_create(x,y,obj_solidblock)

Destroy Event: (Use this one on the brick block.)
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with (mysolid) instance_destroy();

Step Event:
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if ((vspeed > 0) && (y > ystart-4))
{
    //Add here the object you want to make appear on the block.
    y = ystart
    vspeed = 0
    ready = 2
    //Changes the sprite.
        sprite_index = spr_qblock_empty
}
if (ready == 1)
    vspeed += 0.5

Begin Step Event: [?] Block
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if ((collision_rectangle(bbox_left,bbox_bottom,bbox_right,bbox_bottom,obj_player,1,1)) && (ready == 0))
{
    vspeed = -4
    //Makes the block unable to be used.
    ready = 1
}

Begin Step Event: Brick Block
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if ((collision_rectangle(bbox_left,bbox_bottom,bbox_right,bbox_bottom,obj_player,1,1)) && (ready == 0))
{
    alarm[0] = 2 <-- Destroy the object on that event and add some shard object on it.
    exit;
}