Hot on the heels of yesterday’s announcement, adventure RPG Penny Arcade Episode 2 (let’s keep the title short, eh?) and trivia game Are You Smarter Than A 5th Grader are now available for download on the Xbox Live Arcade for 1200 Microsoft Points apiece. Also new on the service is free downloadable content for Marble Blast Ultra which adds a new multiplayer level, as well as a new Achievement.

Courtesy of Major Nelson:

• Content: Penny Arcade Episode Two
• Price: 1200 Microsoft Points
• Availability: Not available in Korea
• Dash Text: [ESRB: M (MATURE) MATURE HUMOR, BLOOD AND GORE, VIOLENCE, STRONG LANGUAGE] Single Player, HD (High Definition). Game is in English only. Want more crazy dialogue and outrageous enemies? Upgrade to the full version of On the Rain-Slick Precipice of Darkness, Episode Two to see the mystery continue and Gabe and Tycho banter in classic Penny Arcade style. Plus, there are leaderboard rankings and achievements to earn, so get started now! This game requires the Xbox 360 hard drive or the 512MB Memory Unit for storage. There are no refunds for this item. For more information, see www.xbox.com/live/accounts.

• Content: Are You Smarter Than a 5th Grader
• Price: 1200 Microsoft Points
• Availability: United States
• Dash Text: [ESRB: E (Everyone)] Do you think you are smarter than a 5th grader? Now is your chance to prove it! Over 6,000 questions in 21 subjects that test your mental mettle. There are no refunds for this item. For more information, see www.xbox.com/live/accounts.

• Content: Marble It Up!
• Price: Free
• Availability: All Xbox LIVE regions
• Dash Text: [ESRB: E (Everyone)] Refresh your Marble Blast Ultra palate for FREE with this brand new multiplayer level! BONUS: Includes one new achievement for your marble blasting pleasure.

Try out the two new games and let us know your impressions below.