This Saturday on Twitch at 2 PM EST (11 AM PST) I will be finishing my stream of the "lost" e-Reader levels for Super Mario Advance 4, which were originally playable by collecting physical cards with barcodes on the back but can be played in their entirety on Nintendo Switch Online. So far I've finished all but the last handful, which I'll be doing this week, including three that were never commercially available and distributed by Nintendo at live events.
Watch at: https://twitch.tv/mcc111