What would you use a second screen for? Don't say map. Don't say inventory. In fact, just be quiet and listen to what HAL Laboratory and Flagship used it for: the inside of Kirby's tummy! Genius! With 2D platform gameplay sprawled across the top-screen, items that Kirby swallows hop the hinge and swim around his guts on the touch-screen. You can then activate them by tapping them with your thumb, or drag them into one another to combine them for bonuses or random power-ups. So, yes, it's an inventory after all - at least they were cute about it.
The rest of Kirby Mouse Attack (Kirby Squeak Squad in the US) follows the 2D Kirby formula with only a few deviations, which we'll get to later. That means that you move from side to side with the d-pad and jump with the A button, with the option of puffing yourself up and floating around the screen indefinitely by continuing to mash it. Super Mario, as they say, eat your heart out. Which of course brings us to the B button, which is used for gobbling up enemies, treasure chests and power-ups; pressing down on the d-pad then swallows them, while pressing B again spits them out.
Kirby's appetite is the basis of most of your interactions with enemies and switches, but the challenge in Mouse Attack isn't borne so much of combat but of level-completion. Your job is to collect treasure chests strewn throughout the game's bite-sized platform levels, and usually you'll need a specific power-up to do so. Gobble a prancing hare weirdo, for example, and you can burrow down to collect elusive goodies. Gobble a sizzling mouse and you can electrocute your enemies. As with Kirby's previous adventures in Dreamland, you'll encounter dozens (well, two-dozen) of these abilities - some familiar, some new.