Voyage/How can I open the heavy door by the exploding mushrooms?
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XXX - Enter the right combination on the lock.
The top two boxes represent a number you are given; in the bottom two boxes, you need to enter the corresponding number to unlock the door.
Click one of the bottom digits to select it. Use the dot and dash buttons to add 1 or 5, respectively, to that number. Use the "square" button to reset the bottom two numbers to zero and pick a new pair of number for the top two boxes.
The lit number on the floor is 6. This is a clue.
There are graffiti on the wall by the lock. This is also a clue.
The graffiti all depict mathematical operations.
A note in the necropolis shows how numbers 3, 4, 5, and 6 are represented.
Check the log: there's a new entry that explains that the Selenites use base 20.
The graffiti show addition: 6+(20 + 14) = (2*20 + 0) = 40; 6 + (2*20 + 4) = (2*20 + 10) = 50; 6 + (20 + 9) = 20 + 14 = 34.
The lock only shows two digits, and allows only a two-digit answer.
Note that in the graffiti, the top number is always 6.
So you need to add 6 to the number represented by the top two boxes, and enter the result in the bottom two boxes.
The panel opens, revealing a lever.
Pull the lever to open the door.
