What The Witness? is a fan game of The Witness (2016) that features custom puzzle mechanics. Most mechanics/puzzle sets are created and shared by game fans, and we collected them in this game. The game is also open-sourced on Github.

　　The Witness (2016) is a logic puzzle game by Jonathan Blow et al. from Thekla, Inc. featuring line drawing puzzles on grids with various rules.

　　Spoiler Warning: What The Witness? assumes that you have played the original game and understand well how original game mechanics work. You are not required to 100% complete the original game. It would be enough if you know how all the symbols work in the original game.

　　In this collection, many fan puzzles were designed and created by various fans during the WitCup contest, a fan-organized competition on solving new The Witness puzzles under limited time. While the 4th and 5th WitCups are already programmed by Artless, other WitCup puzzles were only archived by images and we thought it would be good if we can revive them using a game engine. This is a major reason to start the project. We are also collecting more fans' levels on the way (if they are easy to implement).

　　Puzzle set credits (see in-game credits for full detail):

　　wc1: from the 1st WitCup (by Gentova)wc2: from the 2nd WitCup (by Gentova and Zhvsjia)wc3: from the 3rd WitCup (by Miaoji et al.)wc4: from the 4th WitCup (by Artless), see also https://artless.itch.io/meant-to-be-a-witness-clonewc5: from the 5th WitCup (by Artless and Alith), see also https://artless.itch.io/meant-to-be-a-witness-clone-2-not-witnesswc6: from the 6th WitCup (by Zhvsjia)wc7: from the 7th WitCup (by Alith)wc10: from the 10th WitCup (A by Artless, B by Leaving Leaves, C by Zhvsjia, D by 牙刷架, E by 普通的解谜人, F by sevenkplus, & G by Fluittene)rpg: from the Witness RPG Mod (by Sigma144), see also https://github.com/sigma144/witness-randomizer

　　Game editor: directly borrowed from https://github.com/instr3/WitnessVisualizer. Limited functionality and no documentation. Use under caution (game might break).

　　Source code: now available at https://github.com/Alith-Game-Studio/WhatTheWitness.

　　Notice of update V1.0 from any beta version: Some of your puzzle's solution lines will be misplaced after you update to V1.0. It is expected since we reimplemented the graph format. You can redo these puzzles to resolve this issue. Your progress is not influenced.