Collector's Edition
Collector's Edition
[Cueball stands to the left of a vibrating box.] [The words "Collector's Edition" are written above him and boxed.]

This was the tenth April fools' comic released by Randall . The previous fools comic was 2131: Emojidome from Monday April 1, 2019. The next became 2445: Checkbox released on Thursday April 1, 2021.
It is a large image, of which only part is visible, but can be dragged around. This space acts as a shared virtual sandbox where viewers can interact.  "Items" (small, often humorous images) could be collected from other comics and then placed in this image by viewers. The collection then updated for all viewers in real-time. Multiples of the same item are often seen.
There is a "backpack" at the bottom, similar to backpacks in video games containing items collected by the player. As hinted by the title text, items could be found by visiting different XKCD comics/pages. Randomly, some pages would have a treasure chest which contained the sticker related to the page. The hint would refer to the page which currently had a chest.
The sticker images can be seen at https://xkcd.com/2288/collectors/static/loot/loot_ XXX .png, where XXX is a number from 001-253. Additionally, some images can be found at custom URLs, for example the periodic elements can be found at https://xkcd.com/2288/collectors/static/loot/element- XX .png, where XX is the element, and text loot at https://xkcd.com/2288/collectors/static/loot/loot-words- X .png, where X is the sentence.
As of April 5 2020, chests are no longer dropped.
Click “Expand” to see the full image.
[Cueball stands to the left of a vibrating box.] [The words "Collector's Edition" are written above him and boxed.]
