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Press Keyboard right side: Alt+Enter keys to switch to full screen game play, and Alt+Enter keys to return.

How to play: 

Each game uses different controls, most DOS games use the keyboard arrows. Some will use the mouse.

The gameplay of Heretic is heavily derived from Doom, with a level-based structure and an emphasis on finding the proper keys to progress. Many weapons are similar to those from Doom; the early weapons in particular are near-exact copies in functionality to those seen in Doom. Raven did however add a number of touches to Heretic that differentiated it from Doom, notably interactive environments, such as rushing water that pushes the player along, and items. In Heretic, the player can pick up many different items to use at their discretion. These items range from health potions to the "morph ovum", which transforms enemies into chickens. One of the most notable pickups that can be found is the "Tome of Power" which creates a much more powerful projectile from each weapon, some of which change the look of the projectile entirely. Heretic also features an improved version of the Doom engine, sporting the ability to look up and down within constraints, as well as fly. However, the rendering method for looking up and down merely uses a proportional pixel-shearing effect rather than any new rendering algorithm, which distorts the view considerably when looking at high-elevation angles. As with Doom, Heretic contains different cheat codes that variously give the player invulnerability, all weapons, kill everything on a particular level. However, if the player uses the "all weapons" cheat code from Doom, a message appears warning the player against cheating and takes away all of his weapons, leaving him with only a quarterstaff. If the player uses the "god mode" cheat from Doom, the game will display a message saying "Trying to cheat, eh? Now you die!" and kills the player.

No posted cheats for this game yet.

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