Zero Escape: The Nonary Games (UP)

This unlocks when you reach the true ending of 999.

To open up the route to the true ending, you first need to trigger the 'Safe' ending by going through door number 5, then 8, then 6. After going through door number 5, complete the puzzle and then check the locked safe in one of the closets to trigger some dialogue. The correct dialogue will not be triggered as long as you haven't solved the puzzle.

On any subsequent playthrough, take door number 4, then 7, then 1. In addition, you'll need to pass four story checks. These are:

- Behind door number 4, accept the bookmark Santa offers you.
- Behind door number 4, say "It did seem rather odd" when given the option.
- Behind door number 7, when talking to Seven a prompt says "Do you...". Pick "know about ICE-9?".
- Behind door number 7, give Clover the 4-leaf clover bookmark when given the option.

If you have not unlocked the 'Safe' ending yet, you'll see the rather abrupt 'Coffin' ending. If you have unlocked the 'Safe' ending before, the game continues and you'll reach the 'True' ending.

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).