Tom Spyguy.
Walkthrough: You dont have to take the jepack,but withouth it the game will be extremely hard! There is no yellow key, you have to go above the doors! take the crystal and rifle from the weak platform.Fight the thugs. go right on the ice jump on the logs to get the third crystal, jump on the get to the windmills. get past them and get to the bottom to get the last crystal!