Scrap King - Smelting Empire is a free simulation game available on Android. The game is developed by Robert Petersen and falls under the category of idle games. The player's objective is to collect scrap and reprocess it for smelting. As the game progresses, the player can purchase upgrades to improve efficiency and gain prestige to earn more money.

The gameplay is simple and addictive, and the graphics are visually pleasing. The game's interface is user-friendly and easy to navigate. The game's background music is also well-suited to the game's theme. The game's idle nature makes it perfect for players who enjoy passive gameplay.

Overall, Scrap King - Smelting Empire is an excellent idle game that offers a unique experience to players. The game's simplicity and addictiveness are its strongest features, making it an ideal choice for casual gamers who are looking for a game that they can play in their free time.