Typically, if an older game gets an ESRB rating, that means that the game is set for a re-release on one or more platforms.
This is especially true for PS1 games, and the ESRB has just rated such a release. That game? Klonoa: Door to Phantomile, the classic Namco 2.5D platformer.
This will be good or bad for the physical version of the game, depending on which side of the fence you’re on. If you want to play Klonoa, it’ll be good for you, as prices for the game on bay range from $26 to $495. If you’re wanting to sell the game.. well, actually, with collectors out there, you’ll still be able to anyhow. So good-good all around!