Samantha is trapped in Agartha and must be freed. There are 8 steps that must be performed. This can be done solo although co-op is recommended.
In terms of Gobblegums, anything that can aid in opening the map as early as possible helps tremendously. So Shopping Free and Extra Credit are recommended.
1. Secure the Keys
This step merely requires all four staves be obtained and upgraded.
Quick Guide for obtaining the staves:
- Wind: Disc at Gen 5, Tunnel at Gen 4, Pieces in Robots (one per).
- Ice: Disc at Tank Station (Gen 2), Tunnel at Gen 6, Pieces in Dig Spots when Snowing (one at spawn, excavation site, and church).
- Fire: Disc at Church, Tunnel at Spawn, Pieces obtained by killing the first Panzer (round 8), activating Gen 6, and shooting the glowing plane down (piece by Excavation Site).
- Lightning: Disc by Gen 4, Tunnel at Gen 5, Pieces obtained by jumping off the Tank at specific locations.
- Blank Disc located around Excavation Site, Gramophone located below Pack a Punch. Build staves at bottom of site.
Quick Upgrade Guide:
Wind: In Crazy Place, shoot the circles above Wind entrance so that the combination pointing to the center of the Crazy Place is as follows: L with Line in middle and Triangle Dot, Dot, Two L, and Two Line. In the Main Map, shoot the smoking balls so that they face the Excavation Site (Locations are by Wind Tunnel, at Gen 5, and Tank Path heading towards Church).
Ice: In Crazy Place, match the symbol on the wall with the symbol on the ceiling. There are 6 that will appear out of 12. Quick reference guide (order is on wall to ceiling): empty dot/triangle dot, filled in dot/line, two dots vertical/L, Two dots horizontal one filled in/L with line in middle, Two filled in dots/Line with triangle dot, Three filled in dots appearing to point left/Two Lines, Three dots, right most not filled in/Line and L, Three filled in dots pointing right/Line and L with line in middle, Four dots/L and triangle dot, Three dots left most filled in/L and Line, Three dots center is empty/ Two L, Four dots one not filled in/Two L one with an extra line. Back in the main map, shoot the three tombs with the staff, then use a bullet weapon. Tombs are by the KN-44 wallbuy, near the Excavation Site, and by Tank Station.
Fire: In Crazy Place, kill Zombies with the fire staff on the grate with lava underneath until all four torches are lit (save this for after you've upgraded all of the other staves). At the Church match the symbols on the upper floor with the torch on the lower floor. From left to right, the symbols are 11, 5, 9, 7, 6, 3, and 4 (always used). The ones that are glowing are the ones that must be shot.
Lightning: At the Crazy Place, play the following melody (left to right bottom only): 1,3,6,3,5,7,2,4,6 (pause every three notes). Around the map are eight panels that have knobs to turn. Do so as follows: Spawn, point left/Tank Station, point down/By Wind Tunnel, point up/Gen 5, point down/By Church path, point up/Church Basement, point right/Upper Church, point up. This can be done at anytime.
All: Once both steps are cleared, head to the bottom of the Excavation Site and match the four panels with the color of the orb that appears. Shoot the orb with the staff once finished, then head to Crazy Place to place the staff down. Kill zombies until the staff is finished.
2. Ascend from Darkness
With each staff, the Robots must be entered as follows:
Wind: Excavation Site Robot
Ice: Church Robot
Fire: No robot, instead place at bottom of excavation site
Lightning: Spawn Robot
Inside will be a pedestal for each staff. Place the respective staff in the correct position. Note that all generators must be on for the pedestal to appear. Once completed, all three robots will appear until the next step is completed and all four staves can be obtained at the bottom of the Excavation Site.
3. Rain Fire
Obtain the G-Strike Tactical first. (only one player needs it). This is done by grabbing a tablet at Tank Station, taking it to the Church water basin, killing zombies with melee (Shield counts), taking it back to Tank Station without getting it dirty (take it back to Church if it does), and killing more zombies with melee. Now a player must enter the robot whose foot is glowing and press a button inside the robot. At the same time as the button press, a player with the G-Strike must throw it onto a seal by Gen 5. If done correctly, the seal will break.
Note: Playing solo, only enter the robot from the feet closest to Gen 5, then wait until the very last second of the purge sequence before pressing the button.
4. Unleash the Horde
Build the Maxis Drone (pieces are at Spawn, Excavation Site, and Church) then use it at the now open seal. Ten Panzersoldats will attack after doing this so be prepared with High Damage weapons. The Ray Gun Mark II (box) and Lightning Staff are recommended. Defeat all Panzers to complete the step.
5. Skewer the Winged Beast
Using a Zombie Blood power up, shoot the glowing plane, then kill the invisible zombie. Both can be done in a single power up. Grab the Maxis Drone the zombie drops to complete the step. The Ice staff can be used to obtain zombie blood by shooting the wagons on fire.
6. Wield a Fist of Iron
All players in the game must obtain the One Inch Punch if not obtained by this point (fill the 4 chests until they vanish, then go to Gen 1 or 6 to claim the punch). Head to the bottom of Excavation Site and punch 20 zombies that are glowing white. Once done, grab the tablet that appears to upgrade the punch.
7. Raise Hell
Place all four staves in the Crazy Place Pedestals. Now kill 100 zombies inside Crazy Place using any combination of weapons. Once done, the screen will glow, the walls will vanish, and the achievement is yours.
8. Freedom (optional)
Grab the Maxis Drone from its original build spot, then use it in the center of the Crazy Place. The gateway to Agartha will open, just hold
to enter and end the game.