In July 2011, with permission from Bungie, Daniel Blezek released a version of the original Marathon (and later released the second and third games) for Apple's iPhone and iPad for free (with in-app purchases), running on an iOS port of the Aleph One engine. At the same time, Bungie open-sourced Marathon Infinity under GNU GPL-3.0-or-later, leaving the original Marathon as the only title which has not been open-sourced. The iPad build was further updated in 2019. A community made conversion of Pathways Into Darkness to Aleph One has also been produced.
In July 2011, with permission from Bungie, Daniel Blezek released a version of the original Marathon (and later released the second and third games) for Apple's iPhone and iPad for free (with in-app purchases), running on an iOS port o.f the Aleph One engine At the same time, Bungie open-sourced Marathon Infinity under GNU GPL-3.0-or-later, leaving the original Marathon as the only title which has not been open-sourced. The iPad build was further updated in 2019. A community made conversion of Pathways Into Darkness to Aleph One has also been produced.