T3SDKFixes and mods for Thief: Deadly Shadows

A launcher, a mod loader and an engine API for the Steam release, and a matching decompilation of the game.

Play

Download the launcher, install T3SDK and play at your monitor's resolution, in a borderless window, with widescreen menus and mods.

Getting started

Make mods

Write a mod DLL against a small C API, pack it as a .t3mod file and publish it in the mod index.

Your first mod

Learn how the game works

Levels, objects, the gamesys property system, the game loop, INI files and console commands, as far as they are known.

How the game works

Contribute to the decomp

Rewrite the game's functions as C++ that its original compiler turns into the same bytes, and document the engine on the way.

The decomp handbook

T3SDK works with the Steam release of Thief: Deadly Shadows (patch 1.1). It contains nothing from the game: it changes your own copy, in memory, while it runs. If you don't own the game yet, buy it on Steam.

Questions and help: the Taffer Tavern on Discord. Source code, releases and issues: GitHub.