Differences to X-COM (OpenApoc)

OpenApoc is modelled after the original Apocalypse and enhances the game experience dramatically.

General

• None of these bugs or limits except:
  • Grenade Timer Behaviour: Can be configured to emulate it, and in fact is set as such by default.
• Cross-platform.
• Mouse wheel support.
• Caret for text editing.
• No CPU-based speed (animations play at a constant speed regardless of the computer).
• Mouse input works like modern systems.
• Human-readable savegame format.
• Quicksave/Quickload feature.
• Autosaves and Ironman mode.
• No savegame limit.
• Painless customizability with modular rulesets in human-readable format.
• Full Unicode support.
• Localized in many more languages.
• Take screenshots in-game.
• Standalone "Skirmish" style custom Battlescape mission generator.
• Customizable keyboard shortcuts.
• Native support for in-game music in many different file formats (including OGG, MP3, etc.)
• Customizable display and audio options.
• A built-in and extendable selection of optional display filters.
• Various gameplay options, including XcomUtil and UFO Extender features.
• Corrected erroneous text and descriptions.
• Various UI and quality-of-life enhancements like sliders, scrollbars, etc.
• Melee stat shown in the unit stat page.

Cityscape

• Aircraft weapons may be unequipped.

Battlescape

• Objects, fire and smoke keeps animating while walking or scrolling the screen.
• Pathfinding is a different algorithm: it will always find a solution, if there is one, no matter how difficult.
• AI/behaviour of aliens is different. - Impossible to 100% exactly mimic original AI.
• Waypoint-based projectiles have no upward limit on the number of waypoints they may use.
• The inventories of mind controlled, non-terrorist aliens may be accessed.
• Can use special abilities of mind-controlled aliens.
• The limit on units has been removed, allowing 23 or more soldiers to assault alien bases.
• Unit spawning function has been improved - no more large units stuck in walls.
• Units holding two single-handed weapons will have the fact represented on their sprite.
• Soldier sprites will have their hair and skin recolored to represent their race.
• Can cancel out enemy's mind-control with your own.
• "Not enough equipment" screen shows items missing.
• At the end of the mission, ammo from clips is totalled, so you only lose enough clips to match the total ammo used (as opposed to losing any used clip).
• Soldier equipment loadouts are automatically saved.
• Soldier equipment can be copy/pasted in pre-battle equipment screen.
• Soldier rank and stats accessible from inventory.
• Can load game from Battlescape.
• Right-click opens doors.
• Right-click will cancel a unit's movement, and will cause projectiles to "skip" their flight paths, instantly hitting their target.
• Possibility to use "force fire" when no line of sight is available. (CTRL + Left Mouse Button for firing)
• Tooltips on Battlescape buttons.
• Melee weapons can be used for reaction fire (Chryssalids, Zombies, Reapers, etc).

Optional features

While the above differences are hardcoded, there are also various new "non-vanilla" features you can choose to enable, such as gameplay features and keyboard shortcuts. See the Options section for more information.