For those who are wondering how this game works, here's a little description.
Stacker starts with a row of lights moving side to side. The aim is to try to line up each row so that they stack. Eg. If you start with a line of four, but you stop it and you're off by one, now you only have three for the next line. If you're off by two the next time, now you're down to one block. The margin of error gets smaller each time you miss a perfect line-up, and the blocks move faster and faster, the higher you go.