エニグマ

My kids have been obsessed with passing the Enigma back and forth to decode each other’s notes, and the fact that they just need the same key to unlock the message makes it so simple for them to play independently. I love that it turns a quiet afternoon into a spy mission without any screens involve

Finally, a way to trade notes with my kids that isn't just another app. The encryption key system is simple enough for a 10-year-old, and handing it over really does feel like starting a secret game. My daughter's already hidden it from me twice — mission accomplished.

I love how the sliding cipher ring makes encoding notes so intuitive. My daughter and her friends spent an entire afternoon passing secret messages.