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Neptune (GUMP) - Full Walkthrough
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http://terminalhouse.com/neptune_en.html

- Turn left to face the bed. Click on the pillow to reveal a key. Take the 
key.

- Click on the bottom left corner of the bed (away from the pillow). A small 
orange socket is hidden there. Take the socket.

- Turn left twice to face two metal boxes on the wall. Click on the dark blue 
section of the wall at the bottom of the first metal box (the left one).

- Insert the key into the keyhole at the upper right of the dark blue panel, 
then click on the compartment to reveal a light blue cube and a piece of 
paper. Take the blue cube and the piece of paper. Exit this screen.

- Turn right twice to face the bed, then click on the metal box to look at 
the five-number combination safe. Double-click on the piece of paper in your 
inventory to reveal two puzzles. The numbers inside the five by five grid is 
always different from game to game, so you will need to solve this yourself. 
Note that the sum of five numbers in each column equals twenty-five, and the 
sum of five numbers in each row also equals twenty-five. Once you've 
replaced all the squares with numbers, you should be able to figure out the 
five-number combination for the safe.

- Key in the five-number combination code, then click on the large button to 
unlock this box. Click on the top part of the box to reveal a small vial 
(bottle) and the second orange socket. Take the brown vial and the socket.

- Skip the next three hints if you want the combination to the second safe 
with the least hassle possible. There is a symbol inside the metal box 
containing the brown vial. This forms the number three, so take note of this 
and the diamond engraving on the cover of the box. (3 - diamond)

- Exit this screen and turn right to face the green machine. Notice the 
heart engraving on the wall, then look up to find the next code. Assemble 
this picture to form the number five. (5 - heart)

- Look down and turn right twice to face the wall with two metal boxes. 
There is another code at the bottom left of the door. Click on it to 
examine the code. (2 - club)

- For the last code, look at the blue cube inside your inventory by double-
clicking on it. Note the spade engraving, then click on the bottom part of 
the cube to reveal the last number. (8 - spade)

- Turn to face the wall with two metal boxes, then click on the metal box 
on the left to examine the four-number combination safe. Look at the piece 
of paper inside your inventory and note down the suits at the bottom right 
part of the paper. Replace the suits with numbers (club - 2, diamond - 3, 
5 - heart, 8 - spade), then key in the four-number combination code. Click 
on the top part of the metal box to reveal a purple vial and a key (lying 
flat, don't miss it!) Take the purple vial and the key. Exit this screen.

- Turn right once and click on the blue panel at the bottom part of the 
wall. Insert the key and click on the panel to reveal a hammer. Take the 
hammer and exit this screen.

- Turn right twice, then click on the metal box to look at it. Click on it 
again to open it, then insert both sockets to power up the green machine 
on the floor. Exit this screen, then click on the green machine. Click on 
the cover to open it.

- Now double-click on one of the vials inside your inventory, then click 
on the top part of it to open the vial. Do the same for the other vial.

- Double-click on the blue cube inside your inventory, then click on a 
vial to grab it. Pour the vial into the hole at the top of the blue cube 
to pour the vial's content into the cube. Do the same for the other vial.

- Now you've emptied the contents of the vial into the cube, put the 
cube inside the green machine and close the cover. Click on the button 
to start the machine. Once the machine stops running, open the cover 
again and retrieve the cube.

- Double-click on the cube inside your inventory to examine it, then 
click on the hammer and use it on the cube to break it apart. You will 
receive a yellow stick figurine. Exit this screen and turn right twice.

- Click on the metal box to the right to examine it, then click on it 
again to open it. Place the yellow figurine inside this box, exit the 
screen, then turn right once. Click on this metal box to examine it, 
then click on it again to open it. Pull the blue level contained inside 
to escape.