4G. Part Seven - Harley's Holiday =

Walkthrough for Batman: Arkham Asylum's 'Harley's Holiday' section, covering the Penitentiary, Main Cell Block, and Extreme Incarceration with Riddler trophies, interview tapes, and Joker teeth.

Walkthrough:

1. Penitentiary - Cells Access: Navigate past one armed and two unarmed guards. The path forward is through the south door. Collect the Interview Tape near the entrance, three Joker Teeth at the south end, solve the Riddle in the ladies' restroom mirror, and find a Riddler Trophy in a men's room stall.
2. Penitentiary - Main Cell Block: Follow the blood trail to the south door. Collect three Joker Teeth by grappling to the upper floor and Bataranging them in the offices. Solve the Riddle of the tommy gun on the wall upstairs. Find an Interview Tape in the office area upstairs. Near the south door, blow open a wall to find a Riddler Trophy.
3. Penitentiary - The Green Mile: Continue through this area.
4. Penitentiary - Security Control Room: Climb the steps to the control room. Use the Cryptographic Sequencer to override the nearby security box by aligning the left and right sticks. The oscillator indicates proximity to the mark, and the screen turns green at the correct frequency. Head back the way you came. Collect a Riddle (Cash in a cell). Climb stairs on the north wall and blow open a wall for a Riddler Trophy. Climb stairs on the south wall and use the Sequencer on the door for another Riddler Trophy.
5. Penitentiary - The Green Mile (Return): A Lunatic Inmate will attack; defeat them with one punch and a Ground Takedown. Find a Riddler Trophy in a newly opened cell on the west wall.
6. Penitentiary - Main Cell Block (Return): Quickly grapple to the upper floor to avoid electric shocks. Fight groups of four goons. Be aware of alarms; two goons attempt to access gun cabinets and can be discouraged with Batarangs. After defeating all goons, Harley flees. Head north into the offices, then west to find a security box to turn off the floor's electric field. Descend stairs to the east to deactivate another field, then head west. Deal with two more inmates.
7. Penitentiary - Guard Room: Harley taunts you with two guards over electrified water. Deactivate two security boxes to stop the electricity under each guard (one near the window, one to its right). Cut down the guards. Deactivate the security box near the entrance door (hardest difficulty). Collect an Interview Tape in the control room. Find a Riddler Trophy outside the control room (entrance is a vent cover high on the wall). Collect three Joker Teeth on the way out.
8. Penitentiary - Main Cell Block (Further East): Deal with another inmate in the western area. Continue east; Harley opens a gate. Collect six Joker Teeth (three in the western room, three in the eastern room).
9. Penitentiary - Controlled Access: Defeat one inmate, and another will emerge from a vent. Break the security box on the upper floor. Solve the Riddle on the lower floor in the north wall cell with the