In the context of communicating with Henry, a substitution cipher is sometimes used to convey hidden messages. Below is the alphabet included in IDGI Discoveries to help decipher the messages. It is inspired by the Sumerian cuneiform.
- J, K, Q, X, and Z do not have matching Sumerian characters.
- Sometimes the "L" appears a little bit different.
- "K" may not appear at all ("SEEKER" appears as "SEE ER").
- "Z" appears as a "Z".