Steam Winter 2015:SEARCH prompt
This script causes a popup box to appear after the user types the word SEARCH on the page and presses Enter. The user can then enter text into the box and submit it, which has different effects based on what was entered, and which store page it was submitted from.
940509990147 on Hitman: Codename 47's store page returns the text "ic/4f21ca7"
Hot toddies and maseratis on the Grim Fandango Remastered store page leads to Undertale's store page.
Bullet hell on Undertale's store page leads to Ikaruga's store page.
1v7531 on Ikaruga's store page rewards the user with the Red Herring badge.
Brute Force Attempts
A site for anyone to easily attempt entry strings has been created.