999: Nine Hours, Nine Persons, Nine Doors/Door 4
 2nd Class Cabin (B Deck)
Look to your right and click the object on the table to get matches. After the following conversation, click on the door to go into the next room. Tap the frame on the wall to get a map of the B Deck, and some explanation to go along with it. Turn, right tap the dresser, then the drawer, then click the item in the drawer to get dresser key. Click down then tap the door to exit the room, then turn left and click the other door to go to the other room with Santa and Lotus.
Look to the left and grab candle from the table, then combine it with matches to get lit candle. Click on the open doorway to enter, and you will automatically set down the lit candle on the dresser. Turn right and click on the bed to zoom in on it, then grab the item on top of it to get curtain. The candle will then burn out, so turn left and click on the dresser and then examine the burnt out candlestick to get candlestick key. Hold dresser key and click on the dresser drawer to unlock it, and click it again to open. Grab the plate inside, then click down and tap on the doorway to go back to the main room.
Click on the display case to zoom in, then, while holding candlestick key, click on the handle or lock to unlock it, and then again to open it. Click on the square tile, in the middle shelf, with the black and white shapes, to get another plate.
After your talk with Santa and Lotus, look to the right and click down the hall to make a white arrow appear. Click that arrow to look at the door, and then click it to go into the bathroom. Turn left and click at the ceiling with curtain held to hang it up. Turn right and click on the curtain to open it, then click on the hole to examine it. Click on the curtain to close it, and click on the tile 5th from the top and 3rd from the right. Turn left and click on the door to exit the bathroom, and then click on the main door to head back to the other room, with June.
Click down the hall, then on the white arrow, and then on the door to appear in the bathroom. Select the tile 5th from the top and 3rd from the right to get your third plate. Turn right and tap the door to exit the bathroom, then hit the main door to head back to the other cabin.
Click on the painting at the end of the hall, and then do so again with a plate held. To solve this puzzle, you need to rearrange the plate’ so that the picture mathches the one in the same place in the other cabin.
- Switch the top left and bottom right plates.
- Switch the right two plates.
- Rotate the top left plate twice.
- Rotate the top right plate once.
Click on the object in the hole behind the key to get Mars key.
After a story by Lotus, click down then on the main door to head into the hallway. Click on the big door in the middle while holding Mars key to unlock it, and then tap it again to open it and escape.
 Kitchen (B Deck)
Look to the right and click on that door to head into the pantry. Tap the cheese cabinet on the right, then examine the cheese block 2nd from the top, in the middle, to move it. Grab the newly revealed bottle of oil and hit down to zoom back out. Touch the white cloth on the left side to remove it, and examine the long thin box on the middle shelf. Touch in again to open it, and grab the rusty knife from inside. Tap down twice to go back to the kitchen.
Look to the right and tap the sink in the bottom of the screen for a close-up. Touch the square on the left side to get whetstone, which you then combine with rusty knife to get knife. Look down then left, and tap to examine the door on the left. Examine the deadbolt while holding bottle of oil to undo it, then tap the door to open it.
Click the cabinet on the left to zoom in, and again to open it. Grab the item on the bottom left to get ‘‘frozen chicken’’, and then the item on the top left to get dry ice. Combine the two to get dry ice (crumbled). Look to the left and examine the item on the lowest level of the shelf, on the right side of the far wall, to get chunk of pork.
Examine the trap door at the bottom of the screen, and tap it again to open it. Grab the rope at the top to get sturdy rope, then grab the bottle at the bottom to get water bottle. Combine water bottle and dry ice (crumbled) to get water bottle with dry ice in it, which you combine with sturdy rope to get water bottle bomb. Click back and turn right, then examine the door handle while holding water bottle bomb to open it.
Look to the right and click on the grill to zoom in on it. Click the top of the grill while holding chunk of pork to cook it, and then touch the newly cooked pork while holding knife to get pork note. Look down and right, then tap the oven to zoom in. Tap the timer to zoom in, then hit the keypad to start entering numbers.
The note has the code for the safe. It says "C + 10 + F". These are numbers in the hexadecimal numbering system. For more information on the system, examine the plates on the counter in the kitchen. Lotus will give you an explanation. All you need to know for the puzzle though, is that "C" is 12, "10" is 16, and "F" is 16 in decimal (our normal numbering system).
So, enter "43" in the oven timer, then hit "E" to unlock it. Click down to zoom out, then tap the oven door to open it. Touch the object in the middle of the oven to get Saturn key card. Hit down to zoom out, then examine the door on the right to zoom in. While holding Saturn key card, touch the card reader to unlock the door. Tap the door once more to open it and escape.
 Room Choice
After some plot advancement, you will get to choose what door you want to go through. This decision will have an effect on the ending, and you won’t be able to go through the other door in the same playthrough.
- If you go through Door 3, you will be accompanied by Santa, June, and Seven.
- If you go through Door 7, you will be accompanied by Clover and Seven.
- If you go through Door 8, you will be accompanied by Clover and Lotus.
If you are trying to get a particular ending, check the Endings page to help you choose.
Also, to continue this walkthrough, be sure to go to the page of the door you go through, and not just the next one on the list, as the chronological and numerical order of the doors is different.