Original Sin was funded via Kickstarter last year, amassing a tidy US$944,282 (AU$1,076,119) – more than double its target.
Entry to the alpha is US$39.99 (AU$45.57), which is what the final version will be sold for. A Duo Pack is available for US$59.99 (AU$68.36), and includes copies of Divine Divinity and Beyond Divinity.
The Early Access version currently contains the first 15 hours of the game, and all proceeds from its sale will be directed back into development, said Larian.
“Be aware that it's still rough around the edges and that certain features are missing,” it said.
“If you want a polished experience, we advise you not to play the Early Access version.
“It only makes sense to play an Early Access game if, for instance, you want to support the development of the game, you want to influence development with your feedback or if you want to get a taste of things to come.”
The Early Access version contains both the game's single player and cooperative multiplayer modes, but game saves are not compatible with the game’s final version.