Every action in the game is done via drawing. And all you need is to master the skill of drawing in Malevich's Black Square. Try for yourself below, and get to see some of the Sisters long before the release. The algorythm is simple:

The glyphs surrounding the Black Square are used to perform actions in Tension.

Pick up the brush and draw any glyph on the Black Square

Each correctly drawn glyph will unlock a bonus screenshot

Be patient, it may take a while to load.