Performance
Okay, here's the premise: think of something, anything. It doesn't matter whether it's a pair of pyjamas, the Eurasian Crane or a large tub of KY Jelly. Then answer the questions the 20Q throws at you as honestly and accurately as you can. You'll have some surreal questions ('Is it bigger than a duck?'), some downright ridiculous questions ('Does a basketball player use it?') and some questions you'll have no idea how to answer. But you'll be constantly amused, intrigued and stupefied when it guesses right pretty much every time - even if it's a second or third attempt. If you do make it to 20 questions triumphant, it'll just keep going loathe to admit defeat, hurling mild insults at you all the way to 25 questions when it reluctantly concedes defeat. Seriously, if this thing didn't take batteries you'd swear it was a sentient being.

Practicality
Twenty Questions is a game that anyone of any age and intellect can play, and combined with this version's personality - it ticks you off if you think of rude stuff and comments candidly if it thinks you're wrong - it becomes highly addictive. This computerised incarnation is also about the size of an orange, meaning you can take it anywhere anytime without hassle, which is ace.

Style
Entirely portable and completely round, the designers have actually created a very retro looking piece of kit. It's all blue with a funky red display à la old school Casio alarm clocks. Very Eighties and distinctly kitsch. 

Value
The Game Boy costs £90 new, then it's £30 plus per game, so that's about £120 to get up and running. 20Q costs a tenth of that. Granted, it is a bit of a one trick pony, but we've spent more on a drink than this costs and enjoyed it a hell of a lot less. As the saying goes, 'it's a deal, it's a steal, it's the sale of the century...'

Overall
So it's a little juvenile, and the temptation to try and trick it by thinking of your girlfriend's lady garden is admittedly overwhelming, but that's half the fun. The rules are there are no rules - if it doesn't guess right you're well pleased because you think you're cleverer than a computer and if it does, well you're too stoked at how clever it is to care. Then you have another go... 

it ticks you off if you think of rude stuff and comments candidly if it thinks you're wrong...