Play http://colorrun.pl/ forever

autopilot.js

var ctx1 = document.getElementById( 'color-1' ).getContext( '2d' ), 
	ctx2 = document.getElementById( 'color-2' ).getContext( '2d' );

function simulateClick( target ) {
	var evt = document.createEvent("Events");
	evt.initEvent("click", true, true);
	target.dispatchEvent(evt);
}

setInterval( function() { 
	if( ctx1.fillStyle.indexOf( 'rgba' ) === -1 ) simulateClick( ctx1.canvas );
	if( ctx2.fillStyle.indexOf( 'rgba' ) === -1 ) simulateClick( ctx2.canvas );
}, 10 );