The Tower of Druaga for the PC-Engine is not a port of the original arcade game, but rather an updated remake. The update includes improved graphics with a three-quarters view of the world, expanded story line, greater character customization, and all new puzzles to solve. It was only released in Japan due to the fact that the arcade game failed to garner popularity outside of Japan.
Just as in the original, you control the Babylonian hero of legend, Gilgamesh, as you guide him through all 60 floors of the tower. On nearly every floor, a treasure chest can be collected, but the method to reveal the chest is different for each floor. Unlike the arcade, the goddess Isthar is present to provide players with hints that guide them in the right direction so that they can succeed, although the Pro game leaves the player to their own devices.
The way items and equipment work are substantially different. Gil can choose which components of armor he wears, out of all those that he has collected. He must also select and activate particular items when he wishes to use them (much like Link does in The Legend of Zelda). And finally, throughout the Easy and Normal levels of difficulty, the player can assign and reassign spirit points to particular attributes of Gil's, in order to customize him any way the player wishes.
Translation
A patch to translate the ROM file of this game from Japanese to English has been released. It can be found at Romhacking.net on this page. The author of the patch was StrategyWiki's own Procyon.
Story
IN ANOTHER TIME
Babylon, near the Euphrates River, was protected by the goddness Ishtar. A peaceful light shown from the Crystal Rod. Gil and Ki were in love.
But, A Sumerian Kingdom conquered Babylon. They wished to build a tower that would reach up to heaven and steal the Crystal Rod
Any god with any forbades and destroys the tower with thunder. But it is too late, A demon rebuilds the tower and lives there. His name is Druaga!
Isthar appears to Gil in a dream. "Gilgamesh, someone must reclaim the Crystal Rod. Ki is struggling to do it on her own!" Somene visits Gil. "Ki was caught," he vanishes, "Use your sword."
Praying for help, Gil gets armor, which turns courage into power. Gil sets forth, into the darkness.
The Tower of Druaga