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Hitbox

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The hitbox in Subterranean Animism. Notice the big white dot on Reimu.

A hitbox is the area of an object used to determine collisions. In danmaku games, these are traditionally smaller than the actual image, in order to allow the player to dodge dense patterns.

Games

The bullets have various hitboxes, the general rule being that larger bullets have a smaller ratio of hitbox to image than small bullets (i.e., the larger the bullet, the larger its "safe area" is). In addition, many of the bosses have hitboxes larger than it would appear, allowing the player to hit them more easily.

Character hitbox

In the Touhou games, the character's hitbox is a small area around the waist. In Perfect Cherry Blossom and later games, the hitbox can be made visible by pressing the focus button. This image of the hitbox (on Reimu) is 10x10 pixels in size. This means that, just like danmaku, the actual hitbox of the character is smaller than the sprite.

Even without going into focused mode, however, it is generally possible (and quite easy once you get the hang of it) to give a decent approximation of a hit box's size and location by taking a look at the characters; usually, a small design on their clothing around the character's waist usually can point out where it is.

Additionally, a snowflake or spell circle will also surround the character. These represent the graze hitbox and the item collection hitbox, respectively.

Specific Differences

A visualization of character hitbox sizes throughout the games. NOTE: the hitbox sizes of Sakuya in PCB and non-Reimu shots in IN are 4.0 pixels wide, not 4.4 pixels wide.
  • In the Embodiment of Scarlet Devil, Reimu and Marisa both have a square hitbox 5x5 pixels in width.
  • In Perfect Cherry Blossom, Reimu has a square hitbox 3.3 pixels in width, and all other shots have a square hitbox 4.4 pixels in width.
  • In Imperishable Night, Reimu/Yukari have a square hitbox 3.3 pixels in width, and all other shots have a square hitbox 4.0 pixels in width.
  • From Mountain of Faith to Undefined Fantastic Object, Reimu has a square hitbox 4 pixels in width, Marisa has a square hitbox 7 pixels in width, and all other characters have a square hitbox 6 pixels in width.
  • Starting from Ten Desires, all hitboxes were changed from squares to circles, including player hitboxes. From Ten Desires to Legacy of Lunatic Kingdom, Reimu has a circle hitbox 2.0 pixels in radius, and all other characters have a circle hitbox 3.0 pixels in radius.
  • From Hidden Star in Four Seasons up to the current game, all characters have the same hitbox size of a circle hitbox 3.0 pixels in radius.

Additional Information

  • In DDC, the spell card "Mallet 'You Grow Bigger'" multiplies the character hitbox size by 10.8. In this spell card, Reimu has a circle hitbox 21.6 pixels in radius, and all other characters have a circle hitbox 32.4 pixels in radius.
  • In LoLK, Reisen's bomb increases her hitbox radius by 1.5 pixels per bomb layer present, for a maximum size of 7.5 pixels in radius.
  • In the code for games from HSiFS onward, there are hitbox values for small (2.0 pixels radius), medium (2.4 pixels radius), and large (2.7 pixels radius) sizes. These values remain completely unused.