This game takes a lot of coaxing to get working but once you get it working it works awesome. Here are the steps that I have taken to get it working.
1. I click on Jenga and let it sit at the main screen until my screen times out and my lock screen pops on I think I have this set for around 1 minute.
2. Once the screen dims itself I turn it back on and unlock my xoom. Once this is done I am able to get the games menu up.
3. Once I get it working I start a game and can tap on the screen to get the instructions to go away.
4. To exit the game you have to just repeatedly hit the back button or the home screen just to get it to exit finally.
Its a pain to get working but so far these steps have let me consistently launch and play the game.