Foren / Cotonti / Support / Button Option

Sure it can be done. Easiest is to use XTemplate conditions.

<!-- IF {PHP.usr.level} >= 10 AND {PHP.usr.level} < 15 -->
Download Mission 1
<!-- ENDIF -->
<!-- IF {PHP.usr.level} >= 15 AND {PHP.usr.level} < 20 -->
Download Mission 2
<!-- ENDIF -->
<!-- IF {PHP.usr.level} >= 20 -->
Download Mission 3
<!-- ENDIF -->

Put it in your .tpl file.