Kawazu was mainly responsible for the battle system and sequences , which he based heavily on the tabletop game Dungeons & Dragons and the RPG Wizardry .
Sakaguchi convinced fellow game designers Koichi Ishii and Akitoshi Kawazu to join the project .
Akitoshi Kawazu was mainly responsible for the battle system and sequences , which Sakaguchi based heavily on the tabletop game Dungeons & Dragons and the RPG Wizardry .
Sakaguchi convinced fellow game designers Koichi Ishii and Akitoshi Kawazu to join the project .