OpenBack World Mechanics and Match Modifiers Guide

Encirclement and war exhaustion

Encirclement is active in normal OpenBack rules. A fully surrounded pocket loses troops during repeated checks and is annexed only after remaining continuously closed for 15 seconds, giving the defender time to reopen a corridor. Long fighting also builds war exhaustion, gradually reducing income and troop growth; peace recovers it more slowly than war builds it.

Strategic objectives

When enabled, three to eight neutral objectives are placed far from starting nations. Holding an objective can award gold, troops, radar range, or victory points. Control is checked repeatedly, so the rewards create contested locations rather than one-time pickups.

Six natural disasters

The Natural Disasters modifier rotates through earthquakes, tsunamis, tornadoes, wildfires, meteors, and droughts in a deterministic shuffled cycle. Earthquakes and wildfires can create several impact centers, tornadoes travel along a visible path, and tsunamis move inland from a coast or become a flash-flood surge on landlocked maps.

• Do not cluster every essential structure in one location.
• Watch moving event paths before committing more troops.
• A disaster can force both sides to rethink the same frontline.
• Natural Disasters is optional in solo and private lobbies and can appear in ranked rotation.

Fog, logistics, and shared control

Fog of War hides distant information outside friendly vision instead of placing a simple gray filter over the map. Logistics cargo makes rail benefits visible and interruptible. In private Shared Control games, two or more players can operate the same nation while the configured team size governs how players are grouped.