This guide outlines the differences in the versions from v1.2+ onwards, let's go into more detail:

v1.2/v1.2.1

• This version fixes most of the visual glitches in the game, this version however has a glitch in the clinic where you can skip waiting for the door to the stairs to open after by going left up the stairs saving time, it is a faster version in this section that allows you to take advantage of these glitches but not faster than v1.5.

v1.3

• This version fixes the clinic bug and added an extra cutscene before the fight with the mother, it is a slower version in Ending II, this version in Chapter I when playing on Turbo x4 mode allows you to skip the She is here text faster saving time.

v1.4

• Same as v1.3 except that Alu's HP is reduced by 25%, from this version you can play Survival Mod.

v1.5 PC

• This version adds a cutscene skip so you don't have to watch cutscenes every run, it saves a lot of time, however Chapter III has a lag frame which is hardware dependent, it is more noticeable in John's house and skipping cutscenes from waking up from a nightmare.

v1.5 Switch/Switch2

• This version is identical to v1.5 however this version has no lag frame in Chapter III, in press a new game in Chapter III there is a loading screen for 500 milliseconds (Loading time on Switch 2 unknown) (every new game not counting the first one every time the game starts), this is the fastest version in Chapter III because of the no lag frame, please note that crux glitch frame perfect press is not possible on this version which will lose a few seconds in Chapter I and Chapter II, if you prefer to use this version then it is recommended to use the digital version, the physical version has a bit long loading times, the switch for this version is only available in the English version and no update is planned there.

v1.666 PC

• Game adds Japanese version, Japanese voice is faster than English (tested for chapter 1 for now), however crux frame perfect glitch has been fixed which will cause a bit of time loss in Chapter I & II, lag frame does not occur in John's house as much than in version 1.5 but after the nightmare and intro cutscene it is still there, this version loses 2.600 seconds on the voices in Chapter III, it's not worth using this version.
• Tiffany's fight might be more hard due to DVD logo off-screen glitch fix.
• Japanese version is one second faster in Chapter I in Turbo mode because gun dialogue is shorter.

v1.666 Switch/Switch2 Japanese

• This version is exclusive only on the Japanese market and in the Japanese eshop, this version is still faster in Chapter III, it is the same as v1.666 but the lag frame is not occurring, however you need a Japanese gift card worth 2000 yen to get this version or buy physical copy on ebay, this version loses 2.600 seconds on the voices in Chapter III, it's not worth using this version, but 1.400 faster in Chapter I if you use Switch version.

v1.666 XboxOne/XboxSeries X/S

• Unknown, It should be the same as Switch v1.666, except that it has an English version. At this point, it is not known how this version has differences in speedruns. If you have tested the Xbox version under Chapter III and would like me to post its description, let me know on Discord.

v1.666 PS5

• I think it's the same as the XboxSeries, if you know more about the differences in this version, let us know on the Discord server

Versions from fastest to slowest:

• v1.5 Switch 2/Switch & v1.666 XboxOne/XboxSeries X/S & v1.666 PS5
• v1.666 Switch2/Switch Japanese version
• v1.5 PC
• v1.666 PC
• v1.2
• v1.4
• v1.3