Press the flag and have a look inside. Important: don't use: | \ because it interferes with the cloud list or any special characters. Note: when you use this in your projects, there will be a cloud variable called "Scratcher" make sure you set that to 0 as the saved value but 1 as the cloud value. Note: This is delayed when you save/load so that it doesn't just flash a random sprite that you don't have time to read.
In case you have not seen my first attempt at it: https://scratch.mit.edu/projects/51030334/ Credit to @ErnieParke for the new scratcher detector. Credit to @BSH1 for the font engine. It still only uses 1 cloud variable! Also unlike my first it is nearly all my work! Change log: 0.6: (30 Nov 2015) + Now new scratchers and guests can not use the project. 0.5: (25 Nov 2015) + Some bug fixes. 0.4: (25 Nov 2015) + Project launched.