This stage was pretty tough, IMO. First, just get to the place where there's a big tower with a bunch of enemies on it. It's surrounded by water and there are four vendo's all the way down. Use Munch to zap everyone (may take a while), then put Abe and Munch in front of the two switches, press A to pull one then immediately switch characters and pull the other one. The water level should rise. Go back to the area with the crane and drink the vendo that makes Munch jump higher in water. You should be able to jump high enough to reach the crane now

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