Before games were multimillion-pound 3D extravaganzas with surround sound and Hollywood stars, there was Nintendo’s Game & Watch series: humble LCD devices, each of which played one highly addictive game. These days they’ve become such sought-after items that Austrian game collectors David Gschmeidler and Gerhard Meyer have written a book about them. The Unofficial Game & Watch Collector’s Guide was published in English last summer, but despite being partial to collecting the odd antique Game & Watch myself, I’ve only just discovered its existence. Cataloguing every edition ever made, its completist approach stretches to rarity guides for each game and graphs of their price at auction since 2007. Whether or not you lose sleep to early hours eBay bidding wars, it’s a fascinating read and a beautifully made book. You can buy a copy online at gameandwatch.at.