Back in September, we warned you that Nintendo was about to stop selling "DSiWare points," the digital currency used in its first downloadable game store for the Nintendo DSi. After this week, those points will be officially useless.

That's because Nintendo will be shutting down the DSiWare shop on Friday, March 31. That will also be the last day to re-download games you've previously purchased on any old Nintendo DSi or DSi XL systems you have lying around. Games you've already downloaded should work just fine until the hardware fails.

Points you don't want to use right now can be transferred to be used on the 3DS eShop, and downloaded games can even be transferred to a newer 3DS system for future-proofing. Most DSiWare games are also still available on new hardware through the 3DS eShop, though a few will be lost for good after Friday (and the older downloadable games can look a bit funky on the 3DS' newer screen, too).

The final shutdown of the DSiWare store continues a trend of digital game stores shutting down—and threatening to take chunks of gaming history with them. Last year, Sony shut down PlayStation Mobile, cutting off access to plenty of great Vita titles from smaller indie publishers. Xbox Live's Indie Games program will fully shut down later this year, leaving quite a few hidden gems without an online home. And Apple has begun the process of culling "problematic and abandoned" older games from the App Store, continuing a process of game removal already started by many iOS game publishers themselves.

Unlike DSiWare, used copies of physical Nintendo DS cartridges are still widely available, sometimes at huge discounts on the secondhand market. Those cartridges are liable to work for decades to come on any arbitrary DS or 3DS hardware, too, unlike digital copies that are tied to a specific system.

In any case, if you're suffering from fear of missing out now that the original DSiWare experience is set to go away for good, this crowdsourced list of game recommendations is a good place to start.