Try playing existing adversarial games with them. Instead of a single dice, each player gets a set of them and picks one of them before rolling, without showing

Try playing existing adversarial games with them. Instead of a single dice, each player gets a set of them and picks one of them before rolling, without showing it. Risk gets much more fun that way, for example - because suddenly, even the individual battles are about imagining you can read the other players intentions.