do you remember than floating mouse hand from the begging of homestuck? the on that picked up the cake from john's chest?? what the hell was that? it never appears in the comic ever after

Homestuck is a computer game. That was our cursor interacting with the story. You can see the MSPA reader at their computer a few times throughout the story. As well as the actual Homestuck disks and cartridge in late A5A2 and Mid-Act 6 respectively