|An ARG hidden in The Binding of Isaac: Afterbirth+ expansion|
For the Afterbirth ARG, which preceded the Afterbirth+ ARG, click Afterbirth_ARG here.
The Afterbirth+ ARG began about a month after the release of Afterbirth+ expansion pack for The Binding of Isaac: Rebirth.
On February 7, an blog entry titled 109 was posted to the official Binding of Isaac development blog. The post simply said:
isaacisdead. Both the number 109 and the phrase "isaacisdead" were references to the Afterbirth_ARG Afterbirth ARG, which came before this one.
This ARG is still under investigation - new leads will be revealed or debunked in the days to come.