Crystal Star Games is offering a free expansion to their Chronicles of Arax to anyone who e-mails them until April 26 as an Easter special.
Send an e-mail to firstname.lastname@example.org with the subject ARAX EASTER and you will receive a reply with a promotional code to download an expansion for free.
Chronicles of Arax is a fantasy solo game where you play as an adventurer to take on quests in the world of Arax, to withstand against evil.
The core rules of the game is free and available at their RPGNow page, along with the other expansion quests.
(Picture credit to RPGNow)