The Battle for Wesnoth instance of free and open-source video game
Gameplay
The Battle for Wesnoth is a turn-based wargame played on a hex map. The strategy of battle involves trying to fight on favorable terrain, at a favorable time of day, and, if possible, with units that are strong or well suited against the enemies. Other concerns are capturing villages that produce a particular trickle rate of gold per turn for unit recruitment, and positioning units to restrict enemy movement. Games of Wesnoth come both in the form of single-player campaigns and multiplayer matches. The goal of these games is usually to defeat all enemy leaders, however there may be other goals.
Each unit in Wesnoth has its own strengths and weaknesses. A unit's defense (which  this case means dodge chance) is based on the terrain it stands on. Elves, for example, are difficult to hit when fighting in a forest. Different types of attacks (melee and ranged), weapon types (pierce, blade, impact, arcane, cold, and fire), and a day-night cycle (in most maps) that alternately favors lawful and chaotic units, altering the amount of damage a unit deals. Units can advance to higher level counterparts and become more powerful as they participate in combat.A central design philosophy of the game is the KISS principle; for a new idea to be accepted, it should not complicate gameplay. Another important facet of the game is randomness and its manipulation: it is never certain whether a unit's attack will fail or succeed, only likely or unlikely. Developers have stated that the potential for a skirmish to go better or worse than expected adds excitement, replayability and strategic depth to the game.
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