Copy executable and the data drawer to your games directory (or wherever you wish to place it), and make sure the libraries needed are in the LIBS: drawer.
[1] Min. Requirements: 1Mb ram, mathstrans.library. [2] Demo is available on Aminet (dir: game/think/TwinzPro.lha) as well as the Mutantology compilation CD. [3] An updated version of the game, TWINZ PRO V3.43, is available in its entirety on Aminet (dir: game/think/TwinzV3_Full.lha).