In the old days, kids couldn't wait 'til they were old enough to get their first two-wheeler. Now they yearn for their first Game Boy. The original handheld, as shown at CyberiaPC.com, featured a black-and-green LCD and a slot for matchbook-size game cartridges. The Game Boy's lock on the handheld game market remained virtually unchallenged -at least until the Sony PlayStation Portable arrived last year.