Knights of the Chalice is a PC computer role-playing game (CRPG) for Windows loosely based upon the Open Game Licence 3.5 (OGL), the set of rules at the root of the popular pen-and-paper role-playing game Dungeons & Dragons Edition 3.5, made by Wizards of the Coast. However, many changes had to be made to apply a set of rules designed for a pen-and-paper game to a computer game.
As per the terms of the Open Game Licence, it is clearly indicated within the game which parts follow the OGL exactly and which do not. At the beginning of the game, you create a party of four adventurers - the player characters. Unlike some other games, you do not get to recruit companions later in the game. For each player character you choose a class - Fighter, Wizard or Cleric - and a race - Human, Half-Elf or Half-Dwarf (Mul).
-Turn-based, party-based tactical combat similar to that found in the old Dark Sun Shattered Lands game made by SSI and in Troika's Temple of Elemental Evil.
-User-friendly interface. Launch a charge, full-attack or coup-de-grace with a single click - the computer will automatically look for the best option available. Outside combat, single click to move the party. See How to Play for more information.
-A well-developed artificial intelligence. Enemies act as a group and can use special actions like Grapple or Charge and tactics like taking a five-foot step before casting a Maximised Fireball.
-Omnipresent help files and clear in-game feedback (a feature also found in Temple of Elemental Evil) on the results of each dice roll, saving throw, attack roll, modifiers and so on.
-175 magic spells, most of which were taken from, or inspired by, Wizard of the Coast's open game content.
-With the right feats and sufficient gold and experience points, craft your own weapons and apply enchantments like Wounding, Speed, Flaming Burst and Keen.
-Multiple-choice dialogue that sometimes allows the player to resolve situations in unexpected ways.
-A large campaign largely inspired by the classic Dungeons & Dragons modules Scourge of the Slave Lords and Against the Giants.
-Create your level-1 characters and take them all the way to level 20 (maximum).