I only have spur2 spur3 and spur4 so I can't jump the river to get to the forth puzzle. I have searched the edges of this area looking for a spot that I might have missed but after searching the complete edges at least 4 times I am ready to give up. I know there was a post somewhere to go to another screen and jump a narrower area but I can't figure out where that might be. Frustrated but I won't give up. Can anyone give me a help here, please.