As mentioned in the Title, i don´t know how to use the "Shortcuts". I got to the Jungle a few times, and everytime i gave some Rope, or a Bomb to the Digger. But nothing happens after that. The Yellow Sign, talking about the Shortcuts stayed, and i have to go through the whole 4 Mine-Levels to get into the Jungle. Is is a Bug, or am i missunderstand something?

**** SORT OF (BUT NOT REALLY) SPOILER ****

You have to reach Tunnel Man 3 times for each area. Each time he asks for a different item or money. Once you've given him what he needs three times the shortcut is opened.