One of the earlier pseudo-3D RPG dungeon crawls, this game was released to DOS in 1991, and the PC-98 port followed a year later. Unfortunately, the PC-98 version doesn't really add much to the DOS version, and really doesn't look as nice graphically. You control with the mouse and numpad; attacks are done by clicking on your weapons and such in real-time combat.
To start, you need Disk 1 in the first drive and Disk 2 in the second. Once you've made it to the title screen, you'll need to put the User Disk in the second drive to load your game and actually play.
Download