LEGO Brick Separator Tool
LEGO enthusiasts know all too well how difficult some pieces can be to take apart. If you've ever dealt with that kind of frustration yourself, fear not, because the LEGO Brick Separator Tool is here to save the day (and your fingernails). It's a miracle worker when it comes to separating bricks of all shapes and sizes, from tiles to plates to axles and beyond.
This video shows the various ways the tool can be used:
You can get an 8-pack of these bad boys for $8 on Amazon. That's just a buck apiece, and you'll have plenty of backups in case you lose any of them.