Scratch Debug'ems
Visit this web site https://sites.google.com/site/scratchdebugems/debugems-to-share
Each Scratch Debug'em has one or more errors for you to fix.
Download each one (attached to the bottom of the web page) and fix it.
Please do not post Debug'ems on the Scratch web site because solutions will get posted which will ruin the fun!
Learn more about Debug'em and other Deconstruction Kits here.