What the creator reports
Jev chooses moves, and a Mario death causes four VM branches to try again. A surviving branch becomes the continuing run.
What the repository supports
Microsandbox publicly documents snapshotting and branching and lists Mario Never Dies among its demonstrations. It does not expose the full Jev orchestration here.
Supporting documentation (opens in a new tab)What this does not prove
No game harness, run trace, selection rule, or repeatability test was located. The experiment should not be summarized as Jev independently solving Mario.