The game starts with Lauren visiting her friend Kate's house after she went missing. Easy has infinite flashlight, a great deal of stamina, and the enemies are not very aggressive. The differences being that hardcore allows the flashlight to run out, enemies are more aggressive and the player's stamina runs out quickly. There are also new choices in difficulty (which must first be unlocked by completing the game once) being easy, normal, and hardcore. When caught, the death screen is also different while in Slender: The Eight Pages, the player saw a white static background with Slender Man's faceless head, the one for Slender: The Arrival is black, with an overhead-lit and color-distorted hue. While looking at the Slender Man, the camera succumbs to electronic distortions such as static, blurring, color spots, audio distortion, etc., which obstructs the players vision unless facing away, and far enough from it. The only way of subduing her is by focusing the flashlight (on its second setting) on her. It is unknown whether this is a glitch or an in-game mechanic). In this level, the main antagonist is a girl who chases the player (most often following her path directly, but has been seen teleporting. In level three, it pursues much less aggressively, serving less as the main antagonist of the level and more as a scare tactic, though one capable of teleporting directly in front of the player and ending the game. Its behavior is much the same as this in level four, except more actively. It is observed that its motion centers around following the player, but consists largely of jumping from place to place, the inconvenience of which is increased as each of the eight pages are collected. In level two, it most often teleports off-screen or just out of the character's line of sight, but is capable of appearing directly in front of the player. The Slender Man's behavior changes slightly between levels. This limited defense forces a sense of helplessness, as the best way to survive in the game is to run whenever in danger.

The character is armed only with a flashlight. Slender: The Arrival uses similar mechanics to its predecessor, The Eight Pages. The majority of the game takes place in abandoned areas (house, defunct mine, etc.), each with different objectives.

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