These two activities were used to introduce the students to the use of ALT Codes. They are both riddles which the students must decipher after they have entered the correct Alt codes.
For students with foreign names or for students who will be writing reports which will use symbols for Fahrenheit or foreign currency, remembering the Alt code may be quicker than searching for the correct symbol using the insert function. Plus, it's fun.
Afterwards, have fun making your own riddles. A complete list of Alt codes can be found online.