Playing Wizardry Gaiden 4, I have located 2 of the sacred treasures, but I apparently need 3 of them, and I (thought I) had access to 2 towers and couldn't figure out how to access the third.

Turns out, the way to access the third tower is to press RIGHT on the screen where you select where you want to go. *No* other menu in the game is like that, except maybe the magic menu, where it is *far* more obvious.

Edit: By the way, the dungeon accessed this way is not for beginning characters; there are pit and fire traps that will damage your whole party.