Games highlighted in green are games with confirmed composition. Composition for these games have been confirmed by the composer, or have been directly verified through official sources, such as the game's credits or original soundtrack.

Games highlighted in yellow are games with ambiguous composition. These are games where the composer is confirmed to have worked on the game, but in an ambiguous role, such as being credited along with other people for "sound." The composer may have had a non-composition role in these games, such as creating sound effects.

Games highlighted in red are games with unconfirmed composition. These games have been compiled from unofficial sources of composition credits, such as GMCL, MobyGames, or emulated audio sites. While these sites are generally trustworthy, they may not necessarily describe the composer's true role in the game accurately. As such, the composer may not have actually composed any music for these games, or there maybe have been co-composers not mentioned here.

Uncolored games are those where the composer did not compose any music for the game, but did arrange music that appeared in the game.

Special thanks to Jeriaska and Robert Chrystian for confirming some of the details here through correspondence with Iwatsuki and allowing me to share the information.

YearGame
1991

Chaos World (カオスワールド) [NES]

details: composed two tracks; other music composed by Iku Mizutani (水谷 郁)

source:

What were the two songs you wrote for the Chaos World soundtrack?

HI: I wrote the song for the save file screen and also the village background music. It was early in my career, and I was short on experience, so I was learning as I went along.

Iku Mizutani, the composer on Chaos World, had worked for a different company previously [Konami] and had a lot of experience in the field. At the time, when he first joined Natsume, he was handling all the sound design by himself, but after I joined, he showed me the ropes. He taught me a lot.

-- Gamasutra - News - Interview: 8-Bit to Omega Five with Hiroyuki Iwatsuki

emulated audio: NSF

soundtracks: Chaos World (1991) [TKCA-30392], Rom Cassette Disc In NATSUME Vol.1 (2012) [CDCD-10006]

Choujin Sentai Jetman (鳥人戦隊ジェットマン) [NES]

details: composed all music except for the title theme, adapted from the TV show intro composed by Gouji Tsuno (つの ごうじ)

source: game's credits (screenshot), verified by correspondence with Jeriaska

emulated audio: NSF

Ninja Gaiden Shadow (忍者龍剣伝GB 摩天楼決戦) [GB]

details: Iwatsuki is solely credited for "sound" in the end credits. However, in correspondence with Jeriaska, he claims that Iku Mizutani (水谷 郁) also worked on the game. The only track Iwatsuki has admitted to composing is the ending theme. He says that Mizutani wrote the final boss theme, and it's likely that Mizutani wrote the rest of the original music for the game. The game additionally contains several music tracks adapted from Ninja Gaiden (忍者龍剣伝) for the NES, composed by Keiji Yamagishi (山岸 継司) as "More Yamasan" and Ryuichi Nitta (新田 竜一) as "B.B."

credited as: "Don"

sources: game's credits (screenshot), correspondence with Jeriaska

emulated audio: GBS

Spanky's Quest (ラッキーモンキー) [GB]

details: Iwatsuki is solely credited as the "music composer" in the end credits. However, on the arranged album NATSUME GAME SOUND HISTORY 1988-2009, Iku Mizutani is also credited as a composer. He doesn't seem to have mentioned Mizutani in his correspondence with Jeriaska.

credited as: "H. Iwatsuki"

sources: game's credits (screenshot), NATSUME GAME SOUND HISTORY 1988-2009, correspondence with Jeriaska

emulated audio: GBS

soundtrack: Rom Cassette Disc In NATSUME Vol.2 (2012) [CDCD-10007]

1992

Chase H.Q. II: Special Criminal Investigation [SMS]

details: Iwatsuki worked on the "sound" on this game, with Iku Mizutani (水谷 郁) as the sound programmer. This game is a port of an arcade game of the same name, composed by Takami Asano (浅野 孝巳), and so may not have any original music. This has not been verified, however.

source: MobyGames

Mitsume ga Tooru (三つ目がとおる) [NES]

details: composed all music

credited as: "H. Iwatsuki"

source: game's credits (screenshot), verified by correspondence with Jeriaska

emulated audio: NSF

Pocky & Rocky (奇々怪界～謎の黒マント) [SNES]

details: composed all music

source: game's credits (screenshot), verified by correspondence with Jeriaska

emulated audio: RSN

soundtrack: Rom Cassette Disc In NATSUME Vol.3 Powered by TAITO (2012) [CDGM-10018]

1994

Mighty Morphin Power Rangers [SNES]

details: arranged "Main Theme," originally written for the TV show by Ron Wasserman. Iwatsuki's credited role in the game is "sound" and he was responsible for sound effects; music for the game was written by Iku Mizutani (水谷 郁) and Kinuyo Yamashita (山下 絹代).

source: correspondence with Robert Chrystian

emulated audio: RSN

The Ninjawarriors (ザ・ニンジャウォーリアーズ アゲイン) [SNES]

details: composed all music except "Stage 7 - Train Tracks in the Snow ~ Headquarters (Interior) Elevator," composed by Naoki Tate

credited as: "H. Iwatsuki"

sources: game's credits (screenshot), THE NINJA WARRIORS TRILOGY ALBUM

emulated audio: RSN

soundtracks: Rom Cassette Disc In NATSUME Vol.3 Powered by TAITO (2012) [CDGM-10018], THE NINJA WARRIORS TRILOGY ALBUM (2019) [ZTTL-3007~8]

Pocky & Rocky 2 (奇々怪界～月夜草子) [SNES]

details: composed 21 pieces and wrote all sound effects. The rest of the music was composed by Kinuyo Yamashita (山下 絹代); Haruo Ohashi (大橋 春男) only voiced the stage 3 boss, and Asuka Yamao (やまお あすか) only voiced the player character Pocky.

credited as: "Don"

sources: game's credits (screenshot), correspondence with Robert Chrystian for specific compositions and the sound team's roles

emulated audio: RSN

soundtrack: Rom Cassette Disc In NATSUME Vol.3 Powered by TAITO (2012) [CDGM-10018]

Wild Guns [SNES]

details: composed all music except "SELECT PLAYER," "AMMUNITION DEPOT," and "ENDING," composed by Haruo Ohashi (大橋 春男)

sources: game's credits (screenshot), correspondence with Jeriaska for specific compositions

emulated audio: RSN

soundtrack: Rom Cassette Disc In NATSUME Vol.1 (2012) [CDCD-10006]

1995

All Japan Pro-Wrestling 2: 3.4 Budoukan (全日本プロレス2～3・4武道館) [SNES]

details: worked on "music" with Iku Mizutani (水谷 郁), Haruo Ohashi (大橋 春男), and Kinuyo Yamashita (山下 絹代)

source: game's credits (screenshot)

emulated audio: RSN

Mighty Morphin Power Rangers: The Fighting Edition [SNES]

details: composed "Title," "Player Select," "Versus Screen," "Data Zone," and "Dragon Space Platform"; other music composed by Haruo Ohashi (大橋 春男)

sources: game's credits (screenshot), correspondence with Robert Chrystian for specific compositions

emulated audio: RSN

Mighty Morphin Power Rangers The Movie: Featuring Ivan Ooze [SNES]

details: composed all music except "Player Select," "Cargo Train," "Main Frame Centre," "Stage Clear," "Ending 2," and "Staff Roll," composed by Haruo Ohashi (大橋 春男)

sources: game's credits (screenshot), correspondence with Robert Chrystian for specific compositions

emulated audio: RSN

1996

Gekisou Sentai Carranger: Zenkai! Racer Senshi (激走戦隊カーレンジャー 全開! レーサー戦士) [SNES]

details: worked on "sound" with Haruo Ohashi (大橋 春男)

source: game's credits (screenshot)

emulated audio: RSN

Power Rangers Zeo: Battle Racers [SNES]

coworker: Haruo Ohashi (大橋 春男)

sources: NDGL, SNESmusic.org

emulated audio: RSN

Shin Kidou Senki Gundam W: Endless Duel (新機動戦記ガンダムW ENDLESS DUEL) [SNES]

details: composed "Opening," "Arctic," "City," "Port," "Space Ship," "Tower," "Victory," and "Credits"; other music composed by Haruo Ohashi (大橋 春男)

sources: game's credits (screenshot), correspondence with Robert Chrystian for specific compositions

emulated audio: RSN

2000

Hokuto no Ken: Seikimatsu Kyuuseishu Densetsu (北斗の拳 世紀末救世主伝説) [PSX]

details: responsible for all "sound" except for the opening theme (composed by Michio Yamashita [山下 三智夫] and arranged by Michio Yamashita & Hiromoto Tobisawa [飛澤 宏元]) and ending theme (composed by Hiromi Imakyurei [今給黎 博美] and arranged by Hiromi Imakyurei & Hiromoto Tobisawa), originally from the anime

source: game's credits (screenshot)

2001

Gear Senshi Dendoh (GEAR戦士電童) [PSX]

details: responsible for all "sound"

source: game's credits (screenshot)

Hyakujuu Sentai Gaoranger (百獣戦隊ガオレンジャー) [PSX]

details: responsible for all "sound" except the opening theme, originally composed/arranged by Kotaro Nakagawa (中川 幸太郎) for the TV show

source: game's credits (screenshot)

2002

Ninpuu Sentai Hurricanger (忍風戦隊ハリケンジャー) [PSX]

details: responsible for all "sound" except the opening theme, originally composed/arranged by Takeshi Ike (池 毅) for the TV show

source: game's credits (screenshot)

Road to Wrestlemania X8 [GBA]

coworkers: Iku Mizutani (水谷 郁), Tetsuari Watanabe (渡辺 哲存)

source: MobyGames

Gundam Battle Assault 2 (SIMPLE キャラクター2000シリーズ Vol.12 機動武闘伝Gガンダム THE バトル & SIMPLE キャラクター2000シリーズ Vol.13 新機動戦記ガンダムW THE バトル) [PSX]

details: composed all music

source: game's credits (screenshot)

2003

Kidou Senshi Gundam SEED (機動戦士ガンダムSEED) [PS2]

coworkers: Noriko Fujimura (藤村 宣子), Iku Mizutani (水谷 郁), Tetsuari Watanabe (渡辺 哲存)

sources: GMCL, NDGL

2004

Battle Assault 3 Featuring Gundam SEED [PS2]

sources: GMCL, NDGL

Shinkon Gattai Godannar!! (神魂合体ゴーダンナー!!) [PS2]

details: worked on "sound" with Iku Mizutani (水谷 郁), Tetsuari Watanabe (渡辺 哲存), and Noriko Fujimura (藤村 宣子)

source: GSLA Japan

2005

D.I.C.E.: DNA Integrated Cybernetic Enterprises [PS2]

sources: IMDb, NDGL

2006

Captain Tsubasa (キャプテン翼) [PS2]

details: responsible for all "sound" except the opening theme, originally composed by Hiroshi Uchiki (内木 弘) and arranged by Hiromoto Tobisawa (飛澤 宏元) for the anime

source: game's credits (screenshot)

2007

Gintama: Yorozuya Tube - Tsukkomi-able Douga (銀魂 万事屋ちゅ～ぶ ツッコマブル動画) [Wii]

coworkers: SOLIDTUNE Inc. composed 12 tracks

sources: NDGL, SOLIDTUNE's works list (screenshot)

2008

Omega Five (オメガファイブ) [XBLA]

details: composed all music

source: original soundtrack booklet

soundtrack: Omega Five Soundtrack (2008) [SRIN-1041]

2009

Half-Minute Hero (勇者30) [PSP]

details: composed one track, "The Princess Running Through the Grasslands"

sources: game's credits (screenshot), original soundtrack product page at Marvelous Entertainment for specific composition (screenshot)

soundtrack: Yuusha 30 Sou Original Soundtrack (2009) [MJCD-20165]

Moki Moki (～あなたが回して救うパズル～ もちもちQ) [WiiWare]

source: correspondence with Jeriaska

2010

Kamen Rider Battle: Ganbaride - Card Battle Taisen (仮面ライダーバトル ガンバライド カードバトル大戦) [DS]

source: NDGL

Kamen Rider: Dragon Knight [DS]

details: worked on "sound" with SOLIDTUNE Inc. (Tatsuya Fujiwara, Seiichi Takamoto)

source: game's credits (screenshot)

2011

Half-Minute Hero: The Second Coming (勇者30 SECOND) [PSP, PC]

details: composed two tracks, "Princess, Defender of the Academy ~Theme of Yushia~" and "Parade of REVOLUTION"

sources: game's credits (screenshot), soundtrack tags

soundtrack: Half-Minute Hero: The Second Coming - Original Soundtrack (2014)

Kaizoku Sentai Gokaiger: Atsumete Henshin! 35 Sentai! (海賊戦隊ゴーカイジャー あつめて変身! 35戦隊!) [DS]

source: NDGL

Rurouni Kenshin: Meiji Kenkaku Romantan - Saisen (るろうに剣心-明治剣客浪漫譚-再閃) [PSP]

coworkers: SOLIDTUNE Inc. (Tatsuya Fujiwara [藤原 達也], satoshi, 増山和紀) composed 14 tracks

sources: NDGL, SOLIDTUNE's works list (screenshot)

Toriko: Gourmet Survival! (トリコ グルメサバイバル!) [PSP]

coworkers: SOLIDTUNE Inc. (Tatsuya Fujiwara [藤原 達也], Hiroyuki Ando [安藤 ヒロユキ], Takatsugu Wakabayashi as "Takatsugu," 東堂零, satoshi) composed 13 tracks

sources: NDGL, SOLIDTUNE's works list (screenshot)

2012

Rurouni Kenshin: Meiji Kenkaku Romantan - Kansei (るろうに剣心-明治剣客浪漫譚-完醒) [PSP]

coworkers: SOLIDTUNE Inc. (Tatsuya Fujiwara [藤原 達也], satoshi, 増山和紀)

source: NDGL

Tiger & Bunny: On Air Jack! (TIGER & BUNNY オンエアジャック!) [PSP]

coworkers: SOLIDTUNE Inc. (Seiichi Takamoto [高本 誠一], Hiroyuki Ando [安藤 ヒロユキ], Daisuke Miyake [三宅 大輔], satoshi, des.paul, 沢村拓) composed 10 tracks

sources: NDGL, SOLIDTUNE's works list (screenshot)

Toriko: Gourmet Survival! 2 (トリコ グルメサバイバル!2) [PSP]

coworkers: SOLIDTUNE Inc. (Tatsuya Fujiwara [藤原 達也], Hiroyuki Ando [安藤 ヒロユキ], Takatsugu Wakabayashi as "Takatsugu," 東堂零, satoshi)

source: NDGL

2013

Toriko: Ultimate Survival (トリコ アルティメットサバイバル) [3DS]

coworkers: SOLIDTUNE Inc. (Takatsugu Wakabayashi as "Takatsugu," 東堂零, satoshi)

source: NDGL

2014

Sakigake!! Otokojuku: Nihon yo, Kore ga Otoko de Aru! (魁!!男塾 ～日本よ,これが男である!～) [PS3]

coworkers: SOLIDTUNE Inc. (Seiichi Takamoto [高本 誠一], 田智, Daisuke Miyake [三宅 大輔], 山野一茶, Hiroyuki Ando [安藤 ヒロユキ])

source: NDGL