 In order to carry out executions , players must approach a hunter from behind , undetected . To facilitate this , each scene is full of " dark spots " ( shadows where the player can hide ) . Enemies cannot see into the shadows ( unless they see the player actually entering the area ) . A standard technique in the game is to hide in the shadows and tap a wall to attract the attention of a nearby hunter . When the hunter has examined the area and is moving away , players can emerge from the shadows behind them , and execute them . The game has three levels of execution , with each level progressively more violent and graphic than the last : " hasty " executions are quick and not very bloody , " violent " are considerably more gory , and " gruesome " are over @-@ the @-@ top blood @-@ soaked murders . Players are entirely in control of which level they use ; once players have locked onto an enemy , the lock @-@ on reticule changes color over time to indicate the three levels : white , yellow and red . 
