魔爾街之王-Dungeon Overlord is a free Roguelike strategy tower defense game developed by Chengdu Avalon Interactive Entertainment Co.Ltd. The game offers a unique turn-based operation mechanism based on general tower defense and integrates Roguelike and self-propelled chess gameplay into it.

The game requires players to clear each wave of enemies and choose a new card. Every three of the same cards can help upgrade a tower. Players can also get weapons to enhance their tower's abilities. In the game, towers are called monsters, and players can command dozens of monsters with powerful abilities.

In each game, players will encounter random events, and it's better to focus on upgrading one monster in one game. Players should also remember to strengthen their monsters outside of combat. Successfully guarding the core crystal is the ultimate victory.

The game features stylized portraits of monsters, which could be considered art.

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