I found myself playing it everywhere, even in the car! (Which didn't work.)
If you're new to the series, WarioWare centers around good ol' Wario's attempts to create his own game using the efforts of his so-called 'friends'. Each of his friends have a couple of their own levels of the game, in which you will be presented with a series of microgames, in which you have to perform the correct action in a matter of seconds, or else lose one of your four lives.
In the past game, each level required you to hit the right buttons. In this new one, the "twist" (hahaha! I'm so funny) is that you have an (oversized) game cartridge with a spin sensor built into it. (It looks much like the enormous cartridge from the original Pokemon Pinball.) With this cartridge, you control most of what happens in the game by tilting the GBA left or right, which, of course, causes the current object/character on the screen to move left or right. This is the function on which the game stands.
I can tell you that this got me even more addicted to the game than I did for the original. I spent a lot of time playing this game, and even tried doing it during car rides, (which, as you can imagine, is made quite difficult due to the car making it's own left and right turns).
Twisted! also has many more levels than its predecessor, providing a lot more game time. Furthermore, like in the last game, you are again able to win extras by fulfilling certain conditions, but on a much wider scale. The amount of minigames and "toys" that are available to win is enormous, so by the time you've played for a while, you have a huge collection of fun, quirky features to tinker with for some added fun.
Overall, this game is a great one to add to your collection. Like the original, it makes gives a new face to the classics, and it's cute, quirky, and charming look is something to look forward to. While the storyline lacks a little, that's HARDLY what even matters in a game such as this, so I say, "Who cares?" You'll still have loads of fun.