To complete a level the player has to survive within a set time (varies for each level). The survival will not be easy because of various monsters with different health, armor, weapons, speed, reaction and, importantly, AI parameters in force. When slaying a monster the player gets experience points depending on the class of the killed opponent. Depending on the tactics, the player can survive through the level by killing more or fewer monsters. The monsters are not fixed to certain positions on the level, but chase the player and even able to teleport on the level to close in on the player. The spawning occurs in the growing progression, new stronger monsters spawn to replace the lower-class ones as the player moves towards level completion. We did not want the player to meet unexpected challenges, so we took care to provide him with detailed briefing before each of the level starts. In the briefing the player will obtain information on the arsenal awaiting him in-game, along with detailed description of the opposing monsters, followed by strategy tips. I’d like to warn all players in advance: you won’t be able to save on levels, so be prepared to hold up all the way. All the game data will be saved upon successful level completion. Based on the total amount of the experience points at the game completion, high scorers will be granted a position in the table of records.