One of my fav games, I was used to pokemon at the time so it was a little different, but it grew on me pretty quick, you raise a single digimon, training it in different stats (different stat combos / care mistakes / special things determine what it evolves into) after enough time has passed it will turn back into an egg (different) you choose 1 of 4 eggs, and reraise it, tons of different digimon to get, i'll end there, it's definately worth playing, theres alot to do in it, i'll stop there and let you play it for yourself
anyone who has played it, I got a Hercules Kabuterimon once... he's on an old memory card somewhere, one of my fav gaming moments as a kid