Thunder Force: Gold Pack 2

Thunder Force: Gold Pack 2 (サンダーフォースゴールドパック２) is a compilation of shoot-'em-up games from the Thunder Force series, and was released exclusively for the Sega Saturn by Technosoft in 1996. It is a "sequel" to Thunder Force: Gold Pack 1. The package includes Thunder Force AC and Thunder Force IV, both previously released for Sega System C arcade hardware and the Sega Mega Drive, respectively. The package was not released outside of Japan. This is the only way to play Thunder Force AC on a home system , aside from "Thunder Spirits", which was ported to the Super Famicom.

The port of Thunder Force IV included in the game has some changes made from the original version: there is no slowdown present, sound effects sound more clear but also more silent and the "Styx" ship from Thunder Force III can be selected, along with its weapons, after clearing all the stages on 1 credit (no continues) and entering a special code given after the ending: At the game select screen (TF4 or TF:AC) highlight Thunder Force 4 and hold X+Y and press Start. Continue this on all menues until the game starts. The Styx ship as all weapons and sound effects from Thunder Force III, even the font of the game changes

Both games save the players score to the system memory, a feature missing in the console versions.