;<nowiki>MechWarrior: Dark Age</nowiki>
WizKids created new BattleTech game line called ''
[[MechWarrior: Dark Age ]]'' which employed the substantially different [[Clix]] game rules and had only superficial similarities with BattleTech as it was known until then. To avoid conflict in the shared setting, the new game and the new [[MechWarrior: Dark Age novels|novel line]] accompanying it was set in ca. [], rougly 70 years after the BattleTech timeline at the time. The 70-year gap allowed for some substantial changes to the overall setting and a 'fresh start'.
The creation of the ''MechWarrior: Dark Age'' spin-off brand led to a renaming of the [[MechWarrior Role Playing Game]] into "''[[Classic BattleTech RPG]]''" for the reprint of the third edition, and "''[[A Time of War]]''" (previously the title of the introduction) for the fourth edition. [[ROC]] discontinued their [[MechWarrior series]] of novels in the classic setting and began to publish [[MechWarrior: Dark Age novels]] in the Dark Age setting.
The original board game line was re-branded '''
[[Classic BattleTech ]]''' by[[FanPro]], who had previously held the license for German ''BattleTech'' products. They licensed the rights from WizKids in 2002 and continued to release sourcebooks and supplements under the ''Classic Battletech'' moniker.
IP holder WizKids was purchased by
[[Topps ]] in 2003, and terminated as a brand in 2008 (the brand was since revived, but does not produce BattleTech-related material anymore); ever since, the IP to ''BattleTech'' (and others) are held directly by Topps.
In June 2007, FanPro's license ran out and [[Catalyst Game Labs]] (a subsidiary of [[InMediaRes]] Productions, LLC) acquired the license to Classic BattleTech in their stead. Catalyst also retained many of the staff members who previously worked for FanPro.<ref>[http://catalystgamelabs.com/2007/05/17/inmediares-productions-llc-forms-imprint-catalyst-game-labs Catalyst Game Labs » Blog Archive » INMEDIARES PRODUCTIONS, LLC, FORMS IMPRINT: CATALYST GAME LABS<!-- Bot generated title -->]</ref><br />
The latest iteration of the ''BattleTech'' rules is ''[[Total Warfare]]'' (2006), a streamlined compendium intended to integrate the numerous rules sets that have governed the series into a single, comprehensive volume. ''Total Warfare'' is supplemented by five or more other books (some pending), aiming at producing compatible rulesets for various levels of gameplay:
*''[[TechManual]]'', which presents the design rules for making custom units.
*''[[Tactical Operations]]'', offering advanced rules and equipment beyond those in ''
[[Total Warfare ]]'' and '' [[TechManual ]]'' and offering an updated version of the [[BattleForce]] rules set
*''[[Strategic Operations]]'', updating [[BattleForce|BattleForce 2]] and [[AeroTech 2 Revised Edition|AeroTech 2 Revised]] to provide a large-scale version of the game
* ''Interstellar Operations'', advanced rules to allow playing on a grand strategic scale, playing an interstellar empire instead of individual combat units. This is similar to a previous FASA game named ''[[Succession Wars (Board Game)|Succession Wars]]'' and rules from the ''[[Combat Operations]]'' sourcebook