Bicolline is not a weekend event that resets when the participants go home. The world of Mundus, as its fictional setting is known, has its own persistent geography, economy, and complex geopolitics that have evolved continuously since 1996 in response to player actions and battle outcomes. The political system is modeled on feudal Europe, with fiefdoms, provinces, and kingdoms governed by player-elected nobles. The economy runs on resource cards and a minted currency called the Solar. Goods trade at variable prices depending on supply and the stability of the kingdom. Population cards, issued to every member upon entry, are among the most precious commodities: each guild must accumulate enough to maintain its existence. Much of the real action happens in the so-called virtual world between events, where armies maneuver, economies produce, and sorcerers cast spells that shape the next gathering.

The guild is the fundamental unit of Bicolline, both in the game and out of it. There are 181 recorded guilds and clans, each with distinctive emblems and colors that identify members during battle. A typical guild has about 30 members, though some number in the hundreds. Guilds specialize in military, commercial, political, religious, criminal, or magical pursuits and affiliate with one or more of the game's dozen kingdoms, including the Empire, Andorra, Arganne, Nasgaroth, and the Independent Cities. The complexity of Mundus is so deep that no single person can master more than one domain. Wearing your guild's colors on the battlefield is not merely ceremonial; failing to do so can get your character killed by allies who mistake you for the enemy.

The climax of the Bicolline year is the Grande Bataille, a week-long gathering that culminates in a massive battle lasting three to four hours on the final Saturday. As many as 4,250 participants have attended. For the entire week, every modern object disappears: no cellphones, no modern utensils, no visible camping gear outside designated areas. Participants submerge completely into their characters. Nights bring musical spectacles and shows; days bring skirmishes, tournaments, and the uniquely Bicolline sport of Trollball, where teams compete to place a troll head into a well while fending off attackers wielding foam weapons. All weapons are inspected and approved for safety. Swords and daggers are crafted from foam; arrows are tipped with thick padding. Participants must be at least 16 to join the battle, identified by colored bracelets issued at registration.

What sets Bicolline apart from other LARPs is the sheer permanence of its physical world. The two medieval villages are not temporary stage sets but enduring structures built over years by the most passionate players. The demand for building plots is so high that the site owner spends the entire year reviewing applications, validating architectural plans, and ensuring feasibility. The result is a landscape that feels lived in, a place where characters return season after season to the same tavern, the same guild hall, the same market square. The Bal Pourpre, a masquerade ball, serves as a key social event where guilds reunite to forge alliances and plot strategy. Adventures, a newer addition, focus on intimate narrative events set in specific locations within the game world, running over two days with the New Auberge serving as a familiar tavern hub.