I've played III, V, VIII, IX, and Heroes. I've only beaten V and IX. VIII just kept going and going and my battery died in III and I couldn't save anymore. Heroes is fun and I'm playing it at the moment. I like how it's not really a Warriors game, but a Dragon Quest game with a Warriors battle system. V is my favorite so far, I'm sad that Deberoh isn't in Heroes. But it does make me want to go back and play IV for Alena.