Lena Dunham joins Billy; games Include "Steve Harvey or Harvey Milk", "HBO Girls or Berenstain Bears", "Tyler Perry or Art", "Screaming Tweets", and a special round of "Cash Cow".

Joel McHale hits the streets with Billy to play the "Mo'lympics"; Billy plays "Easter Bunny Lightning Round" and "Buzz Feed List or Schindler's List."

Billy and Patton Oswalt team up to play "Does Shakira Know About This?"; Billy plays "Queen Latifah or Brave Person?," "Thanks for Sharing, Adam Levine" and "Meryl-Go-Round."

Billy and Neil Patrick Harris play a round of "How I Met Your Mother: Lightning Round" and "Racist or Vegetarian?"; Lindsay Lohan joins Billy for "How I Destroyed Your Mother."

Olivia Wilde takes on NYC with Billy for "Olivia Wilde is Very Pretty". Other games include "Humpty Dumpty or Mary J. Blige?" and "You Can't Do That on TV: Adele Edition."

Paul Rudd and Amy Poehler join Billy; Games Include "Would You Have Sex With Paul Rudd?", "Clueless or Childless" and "Would This Disappoint Bill Cosby?", For a Dollar, and "Where Does This Stephen King Novel Take Place?".

Amy Poehler joins Billy for a round of "That's Not Pitbull, It's Amy Poehler!" and "Chipmunk or Huxtable"; Billy plays "Hope for Haiti or Jumanji."

Billy is joined by Seth Meyers and play ` Would Lena Dunham F*** That Cartoon Character'? Billy hits the streets and plays `The Vaginal Four'.

Nick Offerman joins Billy to play "Is This Adorable?", "Lana del Race for the Cure", "She's Talented or She Seems Nice?", "Missed Moments", and a special round of "For a Dollar."

Sean Hayes joins Billy to play "Uninterested or Uncircumcised?" and "Who's the Most Famous Person on Sean Hayes' Phone?"; Olivia Wilde returns to play "John Mayer or Pepé Le Pew?," and Billy plays "Actress Potato Head."