Sealed Solid Eye Viewer came with the used MGA2 I bought from ebay! : r/metalgearsolid
Life in 16-bit: PSP retrospective
Solid Eye Theater - Metal Gear AC!D² (PSP) - YouTube
Metal Gear Ac!d 2 Review / Preview for the Sony PlayStation Portable (PSP) - Cheat Code Central
TOBIDAC!D: Foldable stereoscopic viewer for PSP — Nicolas Nova
TOBIDAC!D: Foldable stereoscopic viewer for PSP — Nicolas Nova
Metal Gear Ac!d 2 - PSP - Review | GameZone
Metal Gear Acid 2 to require 3D goggles. No, really | Ars Technica
Nick Robinson on Twitter: "@_Ravio the "SOLID EYE 3D VIEWER" - very cool, very janky cardboard accessory that came with Acid 2 for playing in 3D. it was honestly kinda sick https://t.co/eGfSU6G6Yb" /
Playstation Portable (PSP) 101: A Beginner's Guide - RetroGaming with Racketboy