There is no permanent "free download" for the general public, but specific legitimate methods exist for obtaining the game at no extra cost:
The Director’s Cut is the definitive version of the 2011 original, adding several significant updates: Q.U.B.E: Director’s Cut Free Download
Legitimate copies are sold through Steam , GOG.com (where it is DRM-free), and various console stores (PS4, Xbox One, Wii U). There is no permanent "free download" for the
This report outlines the status, features, and legitimacy of downloads for , a first-person puzzle game developed by Toxic Games . Download Status and Legitimacy GOG.com (where it is DRM-free)