Having a refund system is beneficial for sales, Facepunch Studios chief Garry Newman reckons.

Newman today tweeted that his hit survival FPS Rust has been refunded on Steam nearly 330,000 times.

That's about six percent of the game's 5.5 million total sales, and equates to US$4.38 million in refunded revenue.

Newman told PCGamesN that a six percent refund rate is about what most developers he's spoken to expect.

The most cited reason for refunding Rust is that the game is "not fun", something Newman said this reason is understandable given Rust's relative opacity.

"I put that down to people using the refund system as a demo," Newman said.

"I think in the long run, people knowing the refund system is there probably gained us more sales than it lost us."

By the way, Rust is half price (NZ$12) in the current Steam Sale.

Who offers refunds for digital games?

Steam offers refunds, provided the game in question was purchased less than a fortnight prior, and has been played for fewer than two hours.

GOG.com offers refunds on games that don't work properly. That is: provided you experience "technical problems or game-breaking bugs that prevent you from finishing your game", and you purchased the game fewer than 30 days prior, you can get a refund.

EA's Origin platform offers refunds on all first-party and participating third party titles, provided a refund request is made within 24 hours of the game first being launched and within seven days of purchase. For pre-orders, a refund request must be made within seven days of the game's release date. You can also get a refund if you can't play a game due to technical reasons "within EA's control", provided you get in touch within 30 days of purchase and within 72 hours after you first launch the game.

Microsoft is trialling refunds on Xbox and Windows 10. The conditions: a refund request must be made within 14 days of purchase, play time must be fewer than two hours across all accounts, the game must be downloaded and launched, and it has to have been out for at least a day.

Ubisoft does not offer refunds on digital games on PC, and neither does Blizzard.

PlayStation offers refunds on games that haven't been launched, but only if the refund request is made within 14 days of purchase.

Nintendo does not offer refunds for digital purchases.