Tiles are still going through walls.

Here is a link to the game I am having troubles with:

Tiles are still going through walls. I still need help with that. Are there any other ways to figure that out? If we fix that, I will eventually have my game done.

I will really appreciate it if someone can help me figure out this problem. The only thing that I need to figure out is getting the tiles to stop going through the wall. For example, when I match a pair of 2s, by dropping 1 on the other, the resulting 4 will fall through the floor of the game. Sometimes when I slide a pair of 2s together, the 4 will go through the side wall.

Thank you,
on 7/30/2019 at 9:54 AM