In the experiment two ravens had to simultaneously pull the two ends of one rope to slide a platform with two pieces of cheese into reach. (sciencedaily.com)
Each level has it's own feel to it and sometimes you really have to think of the fastest and safest way to the end; from sliding platforms, to flame pits, to switches that must be pushed. (thevitalounge.net)
It also features a toddler - safe stair and slide plus a tunnel for crawling underneath the slide platform, too. (abckidsinc.com)