In order to play Skullbuster you must completed each of these steps in this order you can not do them out of order.
Skull 1
Find the Glass Cleaner and Cloth to clean the cabinet screen.
Glass Cleaner locations:
1: In the disco on the top floor next to a pole near the DJ booth.
http://imgur.com/a/NHYtY2: Next to the lockers in the Subway station, on the left side of the boxes that the reel for PaP can sometimes be found on.
http://imgur.com/a/f1drt3: To the left of the stage in Heebie Geebies on the floor.
http://imgur.com/a/PVn9NCloth locations:
1: On a pallet on the roof of the disco, near the Magic Wheel.
http://imgur.com/a/zphbY2:To the left of the Rat King's throne on top a stack of pizza boxes.
http://imgur.com/a/Dl4xC3:In the alleyway next to Heebie Geebies, you need to climb up the ladder and it's laying there on the floor.
http://imgur.com/a/kJkHOSkull 2
Mahjong.
A line of Mahjong tiles spawn up on the roof of the disco, as you come out of the stairway door, look to your right towards the broken skylight you can jump down, they spawn up a small set of steps on a blueish wall. You will need to find 3 or 4 pieces to fill in the blanks. If the line has 5 of any number piece you will need to replace it since you can't win a hand with 5 of any number piece.
Here is a list of pictures of some known locations:
http://imgur.com/a/akjQX or you can watch a video of the locations
-In the little side room inside Heebie Geebies, on an upside-down red crate next to some chairs
-Near Racing Stripes, on a similar red crate, right where you can find the Pink Cat flyer
-In the room above Bombstoppers on a small round wooden table
-On the pallet next to Blue Bolts, where you find one of the character-specific items for the bios
-In the disco on the upper floor, on the left corner of the bar near to the Skull Buster machine
-On the back of the crashed car that is immediately to your left as you go outside the Dojo
-On the only bench that is on the same level as the locker in the second subway station
-On the folding hatch part of the bar in Heebie Geebies
-On one of the taller round tables in the little patio area outside the disco as you head towards Deadeye Dewdrops
-On a bench in the same small room where the Magic Wheel is in the subway above where the train can come through
There are even more locations, check the video I linked above.
Some fireworks will go off above the tiles if you have done it correctly and you will be on to the next step.
You can calculate in what order you need to put your tiles here:
http://mahjong.onevis.net/ How the site works:
You don't need to change anything in the sidebar.
You see 4 rows of tile in the middle of your screen. You only need to use the second row from the top, which consists of tiles with circles that count from 1 through 9 on them.
You then select all the tiles that are in your game (including the ones you found and put in the row on the rooftop) and the site will give you the correct order you need to put the tiles in to complete the step.
If the site gives an error 'Hand composition or winning tile is invalid' that means that you can't win with your current tiles. You have to find another tile on the map and switch it with one on the rooftop.
Skull 3
Candle Windows
You need to be careful with this step, as a failure will mean you will have to wait until the next round to try it again, however, there are 4 mini-parts to it, and you only need to repeat the part you fail, not the entire step. This step requires shooting window panes to form the individual numbers of 1972.
Starting from the area between the disco and the Pink Cat, on the outside of the curved staircase in the disco, on the upper left hand side will be a window with a candle in it now, the goal here is to shoot the panes of the window just to the right of that candle (in this case it is the middle of the three sections of the window) to form the number 1, as you shoot each pane, it will turn to an orangey-yellow color, and you need to shoot them fairly quickly or else you will fail and have to wait until the next round to try again, if you hit an incorrect pane, you will also fail and need to wait until the next round.
Here's what the 1st window should look like
http://imgur.com/a/G8Tq3The second window is located on the roof near Racing Stripes, near the rat cage. Starting from the rat cage location, move to the other side of the roof access door that has the Black Cat poster on it and look over the edge to the building on the other side, if you look to the set of windows on the left, the candle will be in the middle, again, you need to shoot the panes to the right of the candle, it will be more obvious because the window will not have any broken panes. On this window, you will need to form the number 9. This window has more panes so it will be a little trickier than the last one, but the panes need to end up looking like this:
http://imgur.com/a/5XU0WThe '7' window can be found in the downstairs of the disco area, if you come into the disco from the Dewdrops direction and turn left, as you come down this corridor, there are two bigger windows at the end with a candle stand in front of it where you can turn right and go up the stairs to the upper level, out to PaP, etc. this one is again harder than the last one and looks like so
http://imgur.com/a/x75tYLuckily, the fourth and final window is probably the easiest. In the alley on the left-hand side of the dojo, to the left of the side door, are 2 lit up yellowish windows, again, the candles are kind of in the middle, and you're shooting the one to the right, this time, forming a 2. The pattern is as follows:
http://imgur.com/a/0udD2Skull 4
Platform Jumping
This step is also failable, and you can only attempt it once per round, so it might be a good idea to try this at as early a round as you can manage, to give you a better chance of survival if you struggle.
This step involves you heading up the ramp to the roof above Racing Stripes, to the place where you spawn the second Rat King from, you need to have the chi barrier door open, so make sure you do that if you haven't already. If you look out over that drop, you'll see a floating white circle, you need to jump onto it, and then continue jumping from one circle to the next, above the roof. Be careful though, and only about 5 or 6 of these circles will be there at any time, and as each new one appears ahead, the furthest one back will disappear. At the very end, you will have to jump and hit the fourth skull.
Skull 5
The Moving Train
You will either need to have someone to help you with this step or have Up n' Atoms if you're playing solo because it is almost certain suicide, which is why I recommend doing this at an early-round before you have bought most of your perks.
The fifth skull appears on the front of the moving train that passes through the second station regularly, and the only known way of getting this skull is to jump in front of the train. It may be possible to do this without getting downed, but the easiest way to do it is to sacrifice yourself and use of your Up n' Atoms, or have you or a friend jump in front of it to collect it and then get revived, but it's really as simple as that.
Skull 6
Phone it in
This step is super simple too, all you have to do is go to any payphone in either of the subway stations and dial 5550152 and listen to the voice on the other end until the call finishes. This is the number that's on the Skullbuster machine itself You can now play skull busters.
How to play Skullbuster
Going into it, it will be similar to Ghosts and Skulls, and will have the same basic mechanics, only this time there are colored cubes floating around instead of ghosts, and there will be a mixture of colored skulls and non-colored squares with question marks on them, the aim is to throw the colored cubes at the question mark squares to turn them into that particular color skull and create 3 adjacent same-colored skulls, causing them to bind together and be destroyed, they do not need to be in one straight line, they can also form an L shape. On the bottom right corner will be your strike corner. The only way you can get strikes is by throwing the colored cube in places they wouldn't belong. You do not get strikes from going down. You can instantly get a gameover if the skulls advance too far like Space Invaders.
There are 3 waves in this mini-game, each time you complete a wave more skulls will spawn in the next wave. Once you beat all 3 waves you will then be ejected from the game and given all 9 available perks, as well as your Magic Wheel will now have a green beam, instead of the usual colored one. When you go up to the machine, there will be skulls rising up from the top of it, and whenever you spin it, every weapon within the box will be Pack a Punched, and it will still only cost you $950 per spin.