They were some of my first PC games. I played through 1 through 7 (sold as a bundle) with a guide as a kid. (It was still very difficult for me even with the guide at that age. Would have been basically impossible without, except for 7.)
Pretty nifty series. I've heard there are remastered versions (possibly fan-made?) that have removed all the possible softlocks and adjusted some things to be less crazy obtuse, but I don't really know much about them.
"That is why war is so tragic. To win means to make victims of your opponents and give birth to hatred." - Kratos Aurion, Tales of Symphonia