Developed and published by CyTech CodeHouse in 1995, Heresies: Add-ons for Heretic is a third-party commercial add-on collection created for Heretic. The package organizes hand-selected WAD levels across nine databases, including a dedicated DeathMatch collection, and pairs them with the APCi Game Client for map viewing, game setup, WAD management, saved-game management, and modem multiplayer connections to compatible APCi servers. It is not a standalone game and requires a registered copy of Heretic.

Heresies: Add-ons for Heretic is notable as a surviving example of the commercial WAD-compilation market that developed around Doom-engine games during the mid-1990s. Rather than simply placing user-created levels on a disc, CyTech CodeHouse combined organized databases and management utilities with access to the PlayNet multiplayer service, linking locally distributed add-on content with real-time modem DeathMatch play. As the third Developers’ Network CD release, Heresies: Add-ons for Heretic captures the period when fan-created levels, BBS and online services, front-end utilities, and commercial CD distribution were increasingly interconnected.

Collectors interested in Heresies: Add-ons for Heretic may also want to explore Heretic (1994), the required base game; DoomWare: Developers’ Network CD – Occurrence I (1994), CyTech CodeHouse’s earlier collection of Doom and Doom II add-ons and utilities; Hell on CD-ROM: Developers’ Network CD – Occurrence II (1995), the second entry in the Developers’ Network line focused on Doom II content; Magic & Mayhem for Heretic (1995), another commercial compilation of user-created Heretic levels; and H!Zone (1996), a later commercial collection featuring additional levels for Heretic and Hexen.

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