Level 40

is a level stage exclusive to the Bugsters. Having initially emerged as Level 30, said Bugsters advanced to Level 40 before joining Kamen Rider Chronicle.
==Users==
===Bugsters===
*Gatton Bugster (Ex-Aid Episodes 24)
*Kaiden Bugster (Ex-Aid Episodes 24)
KREA-Gatton Bugsterl30.png|Gatton Bugster Level 40
KREA-Kaiden Bugsterl30.png|Kaiden Bugster Level 40
==Notes==
*Similar to the Kamen Riders, the Bugsters each have their own unique roll call acknowledging their level. 
**Gatton Bugster: "Systems rebooting at Level 40!"
**Kaiden Bugster: "I am Kaiden, of the fortieth standing."
*Only Gatton and Kaiden were referred to as having advanced to Level 40; they are noted, however, as having shared their initial Level with Vernier and Charlie.
*Level 20/30/40 Bugsters fusing with their hosts are similar to Fusion Roidmudes from Kamen Rider Drive.
**However, their behavior appears to resemble the Gamma Eyecons from Kamen Rider Ghost in that they possess their human hosts and control them from the inside.
**Once the Level 20/30/40 Bugsters are destroyed, the host's body returns to normal similar to defeating Bugster Unions earlier in the season and the Memory Break concept in Kamen Rider W.
==Appearances==
* Kamen Rider Ex-Aid
**Episode 24: Go Together, Embracing Your Ambitions!