Check if Sprite is Blocked by other Sprites?

I'm using the Board Plugin to randomly create block sprites on the Board. I'm trying to make it to where say if I move a block LEFT, it checks to see if it is blocked by any other sprites, and if there is a empty spot, it moves the Sprite and all the other sprites that are blocking it LEFT.

To put it simply, I just need to be able to Push other blocks if there is space to do so. I've been trying to figure it out for a while with nested loops but I'm just reaching a brick wall everytime. Any suggestions or ideas of how to do this are appreciated

Thanks