Monster Letters is adapted from Feed the Monster, created by Apps Factory, CET and the International Rescue Committee, adapted to English by Curious Learning.
Code MIT/BSD-2; art and audio CC BY 4.0 (digital content © 2016 Apps Factory consortium; translations © 2017-2022 Curious Learning). Fonts: Atma and Noto Sans, SIL Open Font License 1.1.
Changes: rebranded, analytics removed, packaged for wonder.io.