If you're using Chrome, this should save you some time: function step() { var eventObj = document.createEvent("Events"); eventObj.initEvent("keydown", true, true); eventObj.which = 37 + Math.floor(Math.random(0, 1)*3); document.dispatchEvent(eventObj); } int = setInterval(step, 0.001);
After an hour or so, the largest tile is 524288, 2^19: http://i.imgur.com/Yk758sx.png
While I was writing this comment, it collapsed down to the next largest tile, 1048576, 2^20: http://i.imgur.com/PVPCvUC.png