It's day six of Valve's annual Steam summer sales, and there are some great games on sale today: Grand Theft Auto IV, Limbo, Indie Bundle VI, and Company of Heroes are 75 percent off. Black Ops and Wargame: European Escalation are half off. Spec Ops: The Line (personal favorite) is a third off, while Stronghold 3 Gold Edition is two thirds off.

And the best deal by far has got to be Train Simulator at a whopping 90 percent off! How can you resist that deal? To be honest, even we find it hard to pass up at $3.49.

Have you emptied your bank account yet or are you holding out for the final days? The Steam sales this year end on July 22, but there are sure to be tons of great deals between now and then. Leave a comment below or on Twitter.