I replied to another post before reading this one
I would suggest forget trying to challenge them. Try to get something they're interested in. If it's video games for example, try to find a short article on some new video game. Or make one up from other articles.
What's the plot? What do they have to do? Do they want to play this game? Should we try to convince their parents to buy it? At the end discuss where the game takes place. Ask them to draw some characters or somethig for the game.
Have them make up ideas for their own game and write them down.
If it's good you can then later approach some gamers to make it.
Or at least tell them you will.
You can also try things like mad libs.
Keep the readings short and try to find objective driven texts. Things like scavenger hunt type readings or stories that allow you to choose what to do next.
I hope that helps.
Mark