Here are a couple of more online video games, along with their walkthroughs (instructions to win), that would provide useful language-development activities:

Going To Sleep and here is its walkthrough.

Super Sneaky Spy Guy — 10 Rooms, and here is its walkthrough.

I’ve placed both games on my website under Word and Video Games.

Also, if you’ve seen a game on my website that looks good, but I don’t yet have a walkthrough posted for it, you might want to check out Online Games. I’m finding that not only do they have links to some great games I can use in class, but they have a fairly complete collection of walkthroughs, too.