The core of the design was easy – mash up multiple tilesets, create a variant of the cutthroat ruleset, add monsters and treasure to the map, and so forth. Each developer had a different task that looked to take about a day, with a limit of one day of work for each team member to avoid delaying further patches. Of course, the mode also turned out to be a surprise hit, so players can be assured that it will come back in some form in the future; the question is just whether it will be persistent or a limited-time event.
Source: Official Site
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