Quadratis 1.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The Quadratis installer is commonly called Quadratis.exe. We recommend checking the downloaded files with any free antivirus.
Quadratis lies within Games, more precisely Family. The actual developer of the free program is Chris Hollman. You can set up this free PC program on Windows Vista/7/8 32-bit. The following version: 1.1 is the most frequently downloaded one by the program users.
From the developer:
Quadratis is a Direct3D implementation of the classic Tetris game. It emphasizes strategy through the use of a bonus system. Bonuses are given for accomplishments during the game and for the options you chose at the beginning which make the game harder.
You may want to check out more software, such as Monkey Business, Concave Mirror or RhymeTime2, which might be related to Quadratis.