PlayStation 2 · DVD-ROM · NTSC-J (Japan) · SEGA · 2005
Two classic SEGA arcade shooters in one package. SDI puts you in command of a laser defense system in orbit; Quartet is a co-op run-and-gun brawler from the arcades. Part of the prestigious Sega Ages 2500 series — faithful ports with extras, built for fans who know their history.
Why collectors want this: The Sega Ages 2500 series is a cornerstone of any serious PS2 Japanese library. SDI & Quartet bundles two genuinely rare arcade titles that never saw wide Western release. A clean CIB copy with manual is increasingly hard to find — this is the kind of disc that disappears quietly from shelves.
