People are downloading and playing a five-year-old build of Dead Island 2.
The build, which reportedly emerged on the V board of 4Chan, is playable, although there are placeholder assets throughout. It is dated June 2015. Footage from it is popping up all over YouTube:
Eurogamer has verified this build is the work of Spec Ops: The Line maker Yager, which was tasked by publisher Deep Silver with making the zombie sequel before both parties split amid creative differences in July 2015.
