Although no PC betas are known to have been leaked, there are two alternate Mac versions that have shed some light on the development of Oni. One is a leaked beta, and has been called "beta 4" since its leak. It is unknown whether there were later beta versions or if this was the last one before Oni's release. The second is the German localization, known informally as the "Big Blue Box beta", or "beta 5", which is not technically a beta.
During beta testing, Oni's complete list of cheats was leaked. Some fans awaiting the game were intrigued by the "Developer Mode" cheat "thedayismine", but found it did not work in their retail versions of Oni. This code does work in beta 4, however. Later on, it would be discovered that the retail Mac (and PC) Oni still had Dev Mode in them, but the cheat that enabled it would need to be unlocked by engine patching; beta 4 is the only version of Oni observed to have Dev Mode freely accessible.
Also, this beta still had all the BSL functionality of the PC version; it had previously been thought that about 40 functions and about 160 variables were stripped from Oni for the Mac, since the Mac version was finalized a bit later than the PC version. Having seen from beta 4 that these functions and variables were once present in the Mac binary, the community set about searching for them in the current Mac app at the time, Omni Group's OS X port, and found them. Through hex editing, pointers to active variables and functions that were not of much use were diverted to point to some of the hidden and more useful BSL abilities. Those changes brought the Omni app into effective near-parity with the retail PC version; the changes made were documented here. Today, the Intel build from Feral has restored virtually all the BSL that is present in Windows Oni.
This version is v1.1, just like retail Mac Oni, and its creation date is 3/13/01, which, if accurate, means it is not a beta, but a retail version that accidentally shipped with development files. It was originally called "beta 5" by the community because it was thought to come after the leaked beta 4, but it contains files that would likely have come from Oni's pre-beta period. It was also called "Big Blue Box" Oni, or "BBB" for short, because it was sold as part of a collection of four games called The Big Blue Box (it was also sold separately).
As in the retail Mac application, access to Developer Mode and many BSL functions had been removed, but this version had two very unusual features: the level0_Tools files, and some scripts for levels that were not in retail Oni. It also uses the Windows versions of the familiar level scripts. This confirms that the files made available to the localizers predate the final preparation for the Mac gold master, which came after the Windows gold master and included some engine code and BSL changes.
The level0_Tools files (found in GameDataFolder in the usual .dat/.raw/.sep formats) contain resources used during development. The application does not actually seem able to use these tools in-game (in fact, the startup log explicitly records that Oni skips "tool files" such as this one), but the function of the tool files was determined from examining their resources. If you're curious, you can download level0_Tools here. OniSplit can be used to extract the data into individual resources. level0_Tools contains:
- distinct furniture models (OFGAs) (which are now "baked into" the environment of Oni's levels, as generic AKEV quads that are merely flagged as furniture)
- WMDDs that were used at some point to edit OBJCs and other BINA resources (helpful in reverse-engineering the BINA formats)
- textures that were used for debugging, or for other more obscure purposes (the most notable such texture is Hapékat, a mask-less rendition of this little guy not found in-game, and now the depiction of our wiki's mascot)
Secondly, German Oni contains a number of folders within the IGMD folder which are not present in retail Oni either because (a) they provided the logic for levels that were used for testing during development, (b) they represent levels that were merged into other levels, or (c) they represent actual content that was cut from Oni in development. In total there are 10 folders not present in a retail Mac Oni installation: Airport_II, BGI, aop, cap, CZ, CZ_II, pit, ats, SR, and global. The missing levels these scripts referred to, and what the scripts reveal about them, are discussed on the Pre-beta content page.