Subtraction can be difficult for some students to master. I find each year that I need to do a subtraction focus intervention group. The good thing about this (other than the math itself) is that there are a lot of games that can be used for subtraction practice.
It's a great way to also talk about how addition is related to subtraction. Ask questions such as, "How could you turn this into an addition problem?" I like to have them just play the game first and then add in a recording sheet. You can also use a recording sheet that has them write both an addition and subtraction equation and then have a discussion on them.
This game could also be played with dice. So many choices to practice subtraction!