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 |
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