Words beginning with an "X" are a bit more challenging and I have at various times during previous A-Z challenges simply resorted to using words beginning with ex and placed a heavier emphasis on the x part of it.
Today however I decided to turn to a little game Steven used to love playing.

Most of the time it was only Steven and I playing it, though it can be played with up to six players.
You start with the little speedometer at zero and five cards in your hand. On your turn you play a card and then draw another. The MPH cards helped you accelerate your speed. You play the card and turn the wheel on your speedometer to indicate your new speed. First one to get to 200 MPH wins.
Included in the cards were caution cards. When played, all your opponents had to reduce their speed to 25 MPH. Blow Out cards could be played on another player making them have to return their speed to zero. A Pit Stop card has the player of your choice have to skip a turn. A rare 2x or 3x multiplier card allowed you to double or triple your speed.
This game appealed to Steven because of speed and racing.
I enjoyed it a lot because it was an easy one to pick up and play when ever, and the adding and multiplying was a nice bonus to slip in something educational while having fun.
This little game won a creative child Game of the Year award back in 2008, I can see why.
The only complaint I have with this one is that instead of a game box it comes in ziploc "chip bag" of sorts. It works, but it's not my container of choice.