In some countries like Australia and New Zealand, Nintendo is bound by law to accept some types of returns: see https://www.nintendo.com.au/support/articles/refund-for-down... which has an extra section at the bottom:
We can provide a remedy if the game or DLC fails to meet a consumer guarantee under the Australian Consumer Law in Australia or the Consumer Guarantees Act in New Zealand. Details of Australian consumers’ rights under the Australian Consumer Law can be found at www.consumerlaw.gov.au. Details of New Zealand consumers’ rights under the Consumer Guarantees Act can be found at www.consumerprotection.govt.nz.
When you buy video games from Valve Corporation as a consumer located in Australia, the video games come with guarantees under the Australian Consumer Law that cannot be excluded, including a guarantee that the video games are of acceptable quality. You are entitled to a replacement or refund from the retail supplier of the video games for a major failure and for compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the video games repaired or replaced by the retail supplier of the video games if the video games fail to be of acceptable quality and the failure does not amount to a major failure. Certain other rights are available directly against manufacturers that cannot be excluded or limited.