The Tower of Druaga (ドルアーガの塔 Doruāga no Tō)

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The Tower of Druaga (ドルアーガの塔 Doruāga no Tō) is the name of an arcade game released by Namco in 1984 as well as an anime adaptation of the game (The Tower of Druaga: The Aegis of Uruk), which its production company Gonzo chose to make legally accessible through BOST TV, YouTube and Crunchyroll.

The game runs on Namco Super Pac-Man hardware but with a video system like that used in Mappy. It was later ported to the MSX, Famicom and remade for the PC Engine platform. Its first appearance outside Japan was in the third compilation of the Namco Museum series for the PlayStation and also appears on the Nintendo DS and Xbox 360 version of said series.

Originally the game and its sequels had no specific setting other than "the tower". However, in recent years, the series has been retconned as being set in the fantasy kingdom of "Babylim" (a reference to the ancient kingdom of Babylon. This is inaccurate however, because the original Gilgamesh was Sumerian, and not Babylonian).

Wikipedia

The Tower of DRUAGA -the Aegis of URUK-

The long awaited “Summer of Anu” has come.

It is a season that comes but once every few years and during which the powers of the monsters within the Tower wane thanks to the grace of the great god Anu.

Each Summer of Anu, the armies of the Uruk Kingdom secure their strongholds within the Tower, aiming to eventually conquer the upper floors.

Decades of re-fortification and battle have passed since the infamous adventures of Gil and Ki. Their story has now become a legend.

Now, finally, the third Summer of Anu has arrived.

The city of Meskia - the first stronghold built on the first level of the Tower - is brimming with unprecedented expectation. In addition to the Uruk Army, preparing for their third campaign against Druaga, innumerable adventurers have been drawn to Meskia by rumors of a legendary treasure believed to be hidden on the top floor of the Tower...

taken from crunchyroll

The Tower of DRUAGA -the Sword of URUK-

Why do people climb the Tower for the things they seek?

It has been 80 years since the legend of King Gilgamesh.

The impregnable walls of the Tower of DRUAGA have returned again, along with a new evil force.

Jil and his legendary band of followers must journey to the top of the Tower of DRUAGA, defeat the evil forces that lie ahead of them and obtain the mysterious treasure known as the "Blue Crystal Rod."
However, Jil might lose everything in the process. And what is his beloved Kaya seeking? And what could she possibly wish for once they obtain the "Blue Crystal Rod?"

With broken spirits and enigmatic questions that hold no answers lingering, Jil is still trying to figure everything out. Then, a mysterious girl named Kai appears before him and says: “Take me to the top of the tower.”

Kai’s request shrouded in ambiguity, Jil will have another chance to work towards completing his destiny and ascend the Tower. With his hopes and aspirations seemingly slipping out of his hands, Jil must rise to the challenge once again on this never-ending adventure.

Taken from Crunchyroll