Zero Escape: The Nonary Games (UP)

This unlocks when reaching the ‘Submarine’ ending in 999.

Just make sure that the third door you go through is door number 2 to trigger it.

In detail, there are six routes you can take to reach that ending. These are:

- Going through door number 4, then 3, then 2.
- Going through door number 4, then 7, then 2.
- Going through door number 4, then 8, then 2.
- Going through door number 5, then 3, then 2.
- Going through door number 5, then 7, then 2.
- Going through door number 5, then 8, then 2.

If this is not your first play-through, you can speed up previously seen cutscenes by pressing cn_X until it says ‘skip’ in the bottom right corner. If you have not seen that particular cutscene before, pressing cn_X will only cycle between ‘stop’ and ‘auto’. The 'skip' mode will stop when player input is required (for dialogue options or choosing doors).