It's wobbly version of Jenga, not too much hassle to put together, and great fun to play. I wrapped it up for Christmas, and my 4 year old jumped up and down when she opened the paper and saw what it was. "WobBally - knock them down and the laughter begins!" Obviously the advertising worked cos she knew exactly what it was.
All other presents were ignored (including some rather stunning Bratz) as she wanted it set up straight away. I played it with the 4 year old, 11 year old and 13 year old, and yes we had a lot of fun.
Very basically, once you set it up using the handy casing (very quick to do, and part of the fun), turn it upside and you start the game. Roll the dice and it tells you how many of which colour you have to push out without knocking over the whole thing.
This game is so much fun, in a totally basic fashion. Lots of giggles, lots of cheating. 4 year old happily played with it on her own; the 13 and 11 year old got a bit competitive with each other, and the handy bands that come with it mean that even when the whole tower comes tumbling down the balls don't go everywhere - bonus!!
Recommended simple fun - nice one!