The Shakunetsu Hadoken (灼熱波動拳, Shakunetsu Hadouken, "Scorching Heat Surge Fist") is the name of a special type of Hadoken introduced in the Street Fighter II series. It is used by Ryu, as well as his evil side, and Akuma.
| Appearance | Function | Character | Input |
|---|---|---|---|
| Street Fighter: The Movie (arcade game and home video game) All other appearances |
Special Attack | Ryu Akuma |
 + 
|
| Street Fighter II series Street Fighter Alpha series Capcom Fighting Evolution SNK vs. Capcom series |
Special Attack | Ryu Evil Ryu Akuma |
+  +
|
| Street Fighter III series Street Fighter IV series Street Fighter X Tekken |
EX Special | Ryu |  + 
|
Origin
Originally appearing as an animation glitch/bug for causing a Hadouken to randomly be colored red, many players assumed these mysterious "red Hadoukens" caused more damage than normal. Capcom then decided to make this official by officially adding in the Shakunetsu variation to Ryu's moveset.[citation needed]
Description
Executed by performing a half-circle forward or backward motion, depending on the character, and pressing punch, the Shakunetsu Hadoken is imbued with thermal energy that sets it on fire.
Ryu
Ryu's version is considerably less damaging than Akuma's, but Ryu does not charge when using it, thus making his version faster to pull off than Akuma's (about the speed of a regular Hadoken charge). It hits 1 to 3 times.
From Street Fighter III onwards, his version of the move does not appear directly, instead functioning as his two-hit EX Hadoken.
Akuma
Akuma glows red and charges slightly before releasing it. The projectile hits 1-3 times, depending on the strength of the punch button; this also impacts recovery, with light punch recovering the fastest, and heavy punch hitting the most. Akuma's and Evil Ryu's EX Special version hits three times, recovers as fast as the light punch version, and does some more damage.
Evil Ryu
In the Alpha series, Evil Ryu's version is similar to Ryu's: he does not charge when using it, and only hits 1 time. In Super Street Fighter IV, it retains its "charge" property, and functions largely the same as Akuma's.
Sprites
Ryu
Akuma
Screenshots
