Slowly, your stack of blocks grows from the bottom, and you've got to make sure it never reaches the top. Because, once it does, you lose! To eliminate blocks from the stack, line up at least three of one color, horizontally or vertically. Once you do, those blocks disappear, and put off slightly your inevitable demise.
To add to the excitement, chunks of red garbage will fall from above. It is impossible to eliminate this garbage directly. However, if you eliminate any blocks which are touching the garbage, the garbage will shatter into normal, run-of-the-mill blocks.
Throughout the game your stack of blocks will slowly grow from below, initially quite slowly but always faster and faster. When the stack reaches the top it will pause and you have seven seconds to save yourself. It is possible, however, to get a momentary repose from your stack's assent. When you eliminate a block or cause garbage to shatter, the growth of your stack will pause. Even if your stack has reached the top and you're about to lose, you will be given a little more time to save yourself. Time during which a block is disappearing or a chunk of garbage is shattering does not count towards your seven seconds.