Thereafter, the "Starfire" rights were sold to Starfire Design Studio (SDS). SDS updated the Tactical Rules with the 3rd Edition Revised manual (3rdR). Sky Marshall #2 updated the "Imperial Starfire" rules making them more usable. SDS also released "Interstellar War #4: Arachnids (ISW-4)" (electronic only), which was written by David Weber and sold to SDS in a preliminary form by TFG; "Insurrection" (electronic only) is based on the book of the same name by David Weber and Steve White; and "Shipyard" is a computer program to speed the designing of ships. "Admiral's Challenge" is a small scale strategic game (actually more of an operational level game) that uses the tactical rules to resolve battles.