The 4th PS2 Taiko no Tatsujin game, released on July 2004, and is the first Taiko game to upgrade to the PS2-grade graphics engine (Namco System 256), even before the arcade did. As a result, the subsequent arcade releases of Taiko 7 and 8 use Yondaime's in-screen menus as their song list/menus layout format.
Yondaime set the trend for unlocking hidden material for the rest of the PS2 and the first two PSP games; the Don Point system. You're awarded a certain number of these points every time you clear a song or complete a minigame. The amount you get depends on the difficulty of the song and your performance. Go past a certain point total and something gets unlocked, whether it's a song, Taiko sound, or the Oni difficulty.
The modes have also been overhauled. Instead of a two-song Arcade Mode, Survival Mode and Battle Mode, everything has been discarded and replaced with a Play Mode (Ensou Game, the main mode where you play everything), where you're allowed to play through the songs as much as you want without restriction (similar to the Free Mode from older PS2 Taiko games). Minigames still prevail through the makeover. Auto-Play also becomes an official modifier option, with Mekadon from Sandaime appearing on the top-left corner instead of Don-chan.
Just for this game and the next, difficulty stars in Kantan aren't regulated. There are actually 6* songs in Kantan in this version and in Taiko PS2 5. Of course, all 6* have been cut to 5* soon after.
~ Ending variants ~
Don-chan Sekai Ryoko (Muzukashii)
Don-chan Sekai Ryoko (Futsuu)
Don-chan Sekai Ryoko (Kantan)
~ Opening song ~
Ohayou! Taiko Summer (おはよう！太鼓サマー)
Ohayou! Taiko Summer (おはよう！太鼓サマー)
| No. of songs | 40 |
 No. of secret songs | 5 |
J-Pop (9 songs)
| Title |  |  |  |  |
|---|---|---|---|---|
| Sakuranbo (さくらんぼ) Ai Ootsuka | x4 | x4 | x4 | x9 (video) |
| Shanghai Honey (上海ハニー) Orange Range | x4 | x5 | x4 | x6 (video) |
| Tentai Kansoku (天体観測) Bump of Chicken | x4 | x5 | x5 | x8 (video) |
| SHAKE Hayami Kishimoto | x3 | x4 | x5 | x8 (video) |
| Morainaki (もらい泣き) Hitoto Yo | x3 | x2 | x3 | x7 (video) |
| Natsu Iro (夏色) Yuzu | x3 | x3 | x5 | x7 (video) |
| Makenaide (負けないで) ZARD | x4 | x3 | x2 | x2 (video) |
| Aoi Sangosho (青い珊瑚礁) Matsuda Seiko | x3 | x3 | x3 | x7 (video) |
| Kimi Wa Ten-Nen-Shoku (君は天然色) Krud | x4 | x3 | x4 | x4 (video) |
Anime (6 songs)
| Title | | | | |
|---|---|---|---|---|
| GO ! ! ! Naruto | x4 | x4 | x4 | x8 (video) |
| Katsushika Rhapsody ~Yamu Yamu Version~ (葛飾ラプソディー ～ヤムヤムVersion～) Kochikame | x2 | x2 | x4 | x6 (video) |
| BON VOYAGE! One Piece | x2 | x4 | x6 | x8 (video) |
| Tokusou Sentai Dekaranger (特捜戦隊デカレンジャー) | x2 | x3 | x3 | x7 (video) |
| DANZEN! Futari wa Precure (DANZEN!ふたりはプリキュア) | x3 | x3 | x3 | x6 (video) |
| Lum no Love Song (ラムのラブソング) Urusei Yatsura | x4 | x5 | x5 | x9 (video) |
Variety (5 songs)
| Title | | | | |
|---|---|---|---|---|
| Omocha no Cha-cha-cha (おもちゃのチャチャチャ) | x2 | x3 | x3 | x6 (video) |
| Clarinet o Kowashichata (クラリネットをこわしちゃった) | x1 | x1 | x1 | x2 (video) (2P video) |
| Freedom (自由) 12 Girls Band (女子十二楽坊) | x5 | x5 | x5 | x9 (video) |
| Iimondana Furusato wa Meiji Karl no Uta (いいもんだなぁふるさとは 明治カールの歌) | x1 | x2 | x2 | x2 (video) |
| Yappari Saru Getchu (やっぱりサルゲッチュ) | x3 | x3 | x3 | x6 (video) |
Classic (4 songs)
| Title | | | | |
|---|---|---|---|---|
| First Movement from Symphony No.25 (交響曲第25番ト短調より 第一楽章) Mozart | x5 | x5 | x6 | x7 (video) |
| Hungarian Dance No.5 (ハンガリー舞曲 第5番) Brahms | x5 | x5 | x4 | x8 (video) |
| Air de Toreador (Carmen) (「カルメン」より闘牛士の歌) Bizet | x4 | x4 | x5 | x7 (video) |
| Funiculi Funicula (フニクリ・フニクラ) Luigi Denza | x3 | x4 | x4 | x6 (video) |
Namco Original (16 songs)
| Title | | | | |
|---|---|---|---|---|
| Ohayou! Taiko Summer (おはよう！太鼓サマー) | x4 | x5 | x4 | x6 (video) |
| Don-chan Sekai Ryokou (どんちゃん 世界旅行) | x4 | x4 | x6 | x7 (video) |
| Donko's First Date (どん子のファーストデート) | x4 | x4 | x3 | x5 (video) (2P video) |
| Unagi no Tamashii Rock (うなぎのたましいロック) | x3 | x4 | x4 | x6 (video) |
| Onpu no Uta (音符のうた) | x2 | x2 | x2 | x4 (video) |
| Dajare de Oshare (ダジャレdeオシャレ) | x5 | x4 | x2 | x3 (video) (2P video) |
| Buru-chan No Oyatsu (ブルちゃんのおやつ) | x2 | x4 | x5 | x6 (video) (2P video) |
| Scroll Mika (スクロール・ミカ) | x4 | x6 | x6 | x10 (video) |
| Tower of Babel (バベルの塔) | x4 | x5 | x5 | x8 (video) |
| Yokai Dochuuki Ondo (妖怪道中記音頭) | x3 | x3 | x3 | x6 (video) |
| Dragon Spirit Medley (ドラゴンスピリットメドレー) | x4 | x6 | x7 | x8 (video) |
| Ridge Racer | x5 | x6 | x8 | x10 (video) |
| Rare Hero | x5 | x7 | x6 | x9 (video) |
| Thunder Ceptor Medley (サンダーセプターメドレー) | x4 | x6 | x6 | x9 (video) (2P video) |
| Katamari On The Rocks Main Theme (塊オンザロック ～メインテーマ) | x4 | x5 | x5 | x8 (video) |
| Kechadon 2000 (ケチャドン2000) | x6 | x6 | x7 | x10 (video) |
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