Hexen-plus

Hexen-plus, also known as Hexen+ or HexenP, is a executable hack created by Andrey Budko (entryway). It is derived from the Hexen: Deathkings of the Dark Citadel version of HEXEN.EXE v1.1 and provides significantly increased static limits to reduce the risk of crashes, premature program exits and certain visual problems, while maintaining full compatibility with the original executable. It allows several WADs to be playable in the vanilla engine that previously required a limit-removing source port to be run.

Its exact file name is.

History
The last of the Plus hacks by Entryway to appear, Hexen-plus was first released as version 1.1.1 on March 17, 2010, after been inspired from this Doomworld forums from Kristian Käll (Kristus) regarding his map set Hexen: Curse of the Demon Lord. This ultimately saw a partial release in 2017 as Hexen: Curse of the Lost Gods. While the changes for 1.1.1 are unknown, it was quickly followed up by 1.1.2 a day later. In this release, it became known that all of the raised limits featured in Doom2-plus 1.92.6 were included, with the only difference being that the raised limist was not implemented, but the limits of  were being made larger.

In addition to the raised limits, Hexen-plus also included several goodies in its hack, iterating on the Heretic-goodies release of Heretic-plus that occurred in January 2010. Like Heretic-plus, it introduces a bindable inventory, to associate keys with items. The included .crk file would allow the user to rebind the items of an inventory to any key. The majority of the included goodies however centered around extensive support for demos, introducing support for through a switch, multilevel demo's and  support along with disabling of the startup plash screen and various other fixes. Version 1.1.3 was an intermediate release, but 1.1.4 introduced one new feature: The implementation of support. The source file was also split into two seperate files:  for the raised limits, and  for all the goodies.

A final release followed with version 1.1.5, released March 21, 2010. It (incorrectly) announced support for the previously mentioned implementation and it fixed several bugs.

Raised limits
limit                        : old    * k   = new --- visplanes[MAXVISPLANES]      : 128    * 8   = 1024 drawsegs[MAXDRAWSEGS]        : 256    * 8   = 2048 activeplats[MAXPLATS]        : 30     * 256 = 7680 vissprites[MAXVISSPRITE]     : 128    * 8   = 1024 linespeciallist[MAXLINEANIMS] : 64    * 256 = 16384 openings[MAXOPENINGS]        : 20480  * 4   = 81920
 * Hexen-plus inherits the raised static limits of Doom2-plus 1.92.6, with the being obmitted and  being larger (81920 versus 65536).

Additional raised limits
Default additional binds: Alt - Flechette Ctrl - Disc of Repulsion Q - Quartz Flask C - Porkalator
 * Bug fix when turning with mouse
 * support through a command line switch
 * The ability to not quit the game with Q
 * Multilevel demo support
 * Allows the user to show the automap using the TAB key
 * support
 * support
 * No startup splash screen
 * Includes a bindable inventory with the following parameters:

You can rebind any via editing of hexen.crk 000A4D4C: 00 FF ; Ring of Invincibility 000A4D4D: 00 71 ; Quartz Flask 000A4D4E: 00 FF ; Mystic Urn 000A4D4F: 00 FF ; Mystic Ambit Incant 000A4D50: 00 FF ; Dark Servant 000A4D51: 00 FF ; Torch 000A4D52: 00 63 ; Porkalator 000A4D53: 00 FF ; Wings Of Wrath 000A4D54: 9D FF ; Disc of Repulsion 000A4D55: 00 B8 ; Flechette 000A4D56: 00 FF ; Banishment Device 000A4D57: 00 FF ; Boots of Speed 000A4D58: 00 FF ; Krater of Might 000A4D59: 00 FF ; Dragonskin Bracers 000A4D5A: 00 FF ; Chaos Device

'a'-'z' -> 0x61-0x7A, '0'-'9' -> 0x30-0x39, etc FF means "no bind"