Always the kidder, Valve launched a Potato Sack bundle on April Fool's Day, offering 13 indie games for 75% off. It didn't take long for fans to notice potato-themed easter eggs hidden in various games in the bundle, and they've been collected and detailed on the Valve ARG (Alternate Reality Game) Wiki.
Several components of the ARG have been discovered so far, but they don't seem to add up to a complete picture quite yet. Among the discoveries, we've seen a hidden adventure game and QR code in Defense Grid, hidden Razor peripherals messages in Kick It, a puzzle message in The Ball, and a hidden Aperture Science logo on the bit.trip Web site.
Ultimately, this could be a bit of viral marketing for Portal 2, a new game announcement, or something else entirely. We'll keep our eyes peeled for more details as this ARG reveals more juicy tidbits.