The third release in the series includes the Orcs on the March expansion (which is the expanded version of Princess in Armour campaign, with totally rebalanced orcs), the two new independent campaigns and an editor with help system. The editor allows the user to create additional content for the game and alter it in any way.
The development of expansion pack was revealed on May 24, 2010 by 1C Company and Katauri Interactive. New additions that were announced in the expansion pack included two new campaigns Champion of the Arena and Defender of the Crown, Orcs on the March expansion for King's Bounty: Armored Princess, new quests, items, spells and creatures. A game-editor was also announced allowing players to create mods for King's Bounty' Armored Princess with the help of the tool. The game was released on September 17, 2010 and was released in three different editions. The standard version contains the new content of King’s Bounty: Crossworlds and requires an installed version of King's Bounty: Armored Princess. The Game of the Year Edition contained both King's Bounty: Armored Princess as well as King’s Bounty: Crossworlds. King's Bounty: Platinum Edition contains King's Bounty' Armored Princess and King’s Bounty: Crossworlds along with King's Bounty: The Legend.
The game holds a score of 78/100 on Metacritic and an aggregate of 75.7% on GameRankings.King's Bounty: Crossworlds received an 8/10 from Brett Todd of GameSpot, who said that the "combat is still no walk in the park", and that although the game "feels awfully familiar, it is also the best version of the strategy role-playing hybrid yet released." Mike Splechta of GameZone awarded it a score of 7/10. Jazz McDougall of PC Gamer gave it a score of 78/100, calling its campaigns less interesting than the King's Bounty: Armored Princess.