Escape from XP

Escape from XP
Developer: Bradley and Montgomery Publisher: Microsoft Platform: HTML5 Released internationally: April 10, 2014 This game has unused graphics.

Escape from XP is a gimmicky little game that was created to advertise the official discontinuation of Windows XP (and by extension, Internet Explorer 6). It was up officially for only a few months, but its source was saved on multiple open-source repositories and can still be accessed here.

Unused Graphics

An entire spritesheet for a hacker that would have appeared in the background pressing the Z key. However, he can only be seen by entering the following code in the console:

event = { source: { postMessage: function () {}} };
["hardcoreMode", "originalHacker", "tanksTanksTanks", "IDDQD"].forEach(
  window.ig.game.installServicePack.bind(window.ig.game)
)

(Source: Andreas Madsen)