Groupees' fourth pay-what-you-want Build a Bundle has launched, offering a selection of up to nine games and additional bonus material for a minimum purchase of $1.50.

Games featured in Build a Bundle 4 include 9heads' first-person puzzler Vitrum, Camel 101's fantasy-themed tower defense title Orczz, and bignic's isometric shoot-'em-up Zombies.

Buyers may also choose to add Stellar Impact, Robin Hood: The Legend of Sherwood, Qasir Al-Wasat: A Night in-Between, Men of War, Fantasy Wars, and Velvet Assassin to their custom bundle packages. Twenty percent of every purchase will be donated to the American Red Cross charity.