Purchase 14 days, and the game running time must be less than 2 hours. If you meet the above requirements, you can go to the new customer service page for an unconditional refund:

(This is the new version of the customer service website, and the new version needs to log in with the Steam account. )

You can choose to return the refund amount to the Steam wallet or the original payment account, such as credit card or PayPal account. If Steam can't directly return the original payment account, it will also return the Steam wallet. The currently supported return methods can be referenced (different in different regions):

The following will explain some special refund instructions for games and software, but Valve also said that even if it does not meet the requirements, it can still ask for a refund, and they will evaluate the audit.

After the introduction of the new policy, you can refund on Steam for any reason, such as your PC hardware didn't meet the requirements of the game, or you regretted it immediately after buying it, or you tried it and found that it wasn't your interest. Of course, this policy is not completely unlimited.