Open-world dinosaur game Ark: Survival Evolved has sold over one million copies, and developer Studio Wildcard has launched new modding tools to celebrate.

A Steam Early Access success story, Ark: Survival Evolved sold 400,000 copies in its first week of alpha release last month, handily paying for its development to date.

The game's Unreal Engine 4 mod tools were developed in partnership with Epic Games.

"We can't wait to see the limitless creativity of our fans come to life in fantastic new ways," said co-creative director Jesse Rapczak.

Epic's Tim Sweeney added, "Many of us here began in the mod community, so we're grateful to see Studio Wildcard open up their creative work to a new generation of programmers, artists, and designers."

Ark: Survival Evolved is available now via Steam Early Access.