Slenderman Must Die: Chapter 1 - Sanatorium is a free Android game developed by Poison Games in the Adventure subcategory of Games. This game offers a completely new Slenderman experience with great 3D graphics. The objective is to collect 8 pages, but this time you have a gun to shoot Slenderman and escape the horror. The level of details can be changed to fit your device, and the game is available for free with the full version of Slender Man.

The game starts at Sanatorium, where rumors have it that Slenderman likes to hang around. To make Slenderman appear, the player must collect 8 pages. The game offers the player a gun to shoot Slenderman and survive. The game also provides an opportunity to find a shotgun, but ammo is limited, so the player must be careful while using it.

Overall, Slenderman Must Die: Chapter 1 - Sanatorium is an exciting game with immersive gameplay and challenging tasks.