Thunder Force AC

From Sega Retro


ThunderForceAC SystemC2TitleScreen.png

Thunder Force AC
System(s): Sega System C2
Publisher: Sega
Genre: Shoot-'em-Up

Release Date RRP Code
Arcade (System C2)
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Thunder Force AC (サンダーフォースAC) is an arcade port of Technosoft's 1990 Sega Mega Drive game Thunder Force III to the nearly identical Sega System C2 hardware, produced jointly by Technosoft and Sega.


This port was ported to the SNES in 1991 as Thunder Spirits without Sega's involvement (it was handled by Toshiba EMI, with Seika publishing in the US). The new music for Planet Haides is included as a bonus track (OMAKE-2) in Thunder Force IV, accessible after beating the game.


The port is identical to the console version, except Planets Haides and Ellis are completely different, the level layouts are somewhat different, the level select and level intros have been removed and continuing starts you where you died instead of at the beginning of the stage. Furthermore, the game takes advantage of the System C2's µPD7759 ADPCM chip, providing a larger number of voice samples and sampled sound effects — similar to the original X68000 version of Thunder Force II (even borrowing some cues).

Magazine articles

Main article: Thunder Force AC/Magazine articles.

Promotional material

ThunderForceAC Arcade JP Flyer.jpg
JP flyer
ThunderForceAC Arcade JP Flyer.jpg

Physical scans

System C, JP
Instuction card(s)


Thunder Force AC

ThunderForceAC SystemC2TitleScreen.png

Main page | Magazine articles

Music: Technosoft Music Collection: Thunder Force III & AC (2020)

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Thunder Force games for Sega systems / developed by Sega
Sega Mega Drive
Thunder Force II (1989) | Thunder Force III (1990) | Thunder Force IV / Lightening Force: Quest for the Darkstar (1992)
Thunder Force AC (1990)
Sega Saturn
Thunder Force: Gold Pack 1 (1996) | Thunder Force: Gold Pack 2 (1996) | Thunder Force V (1997)
Sony PlayStation 2
Thunder Force VI (2008)
Nintendo Switch
Sega Ages Thunder Force IV (2018) | Sega Ages Thunder Force AC (2020)
Thunder Force related media
Best of Thunder Force (1997) | Thunder Force VI Soundtrack Demo (2008) | Thunder Force IV (2019) | Technosoft Music Collection: Thunder Force III & AC (2020) | Technosoft Music Collection: Thunder Force IV (2021) | Technosoft Music Collection: Thunder Force I & II (2022)