Halloween Blocks: Jeff and Sl is a free action game developed by RHGames for Android. The game is set in a spooky forest where the player has to collect eight pumpkins while avoiding two notorious killers - Slenderman and Jeff the Killer.

The game features simple controls that allow easy movement of the character. The player can jump, move left or right, and attack the killers with weapons such as axes and guns. The game also offers power-ups to help the player in their quest.

The graphics are spooky and well-designed, providing a creepy atmosphere that adds to the overall experience. The sound effects and music are also well-suited to the game's theme. Halloween Blocks: Jeff and Sl is a fun and challenging game that is perfect for Halloween or horror game enthusiasts.