The following commands are used to define the logic and text in 'Mug. Missing.. The DSL for the game is simple-minded so not a general-purpose language. It was designed for this one game alone.
| Command | Description |
| after | If a result is taken the text specified by an after command will be inserted into the new scene description |
| before | If a choice is active the text specified by a before command will be inserted into the current scene description |
| choice | A choice that can be taken in a scene |
| debug | List internal Twee variable value on each page for game entity like choice etc |
| dialogue | A list of prompts and responses that must be exhausted before any choices |
| goto | Scene to go to in a result |
| prompt | A prompt in a scene or dialogue for having to chose an option |
| option | A choice for a dialogue or in a scene |
| response | A response in a dialogue to an option chosen |
| result | Define result of taking a choice |
| scene | A scene in a world with a description possible dialogue and choices |
| set | Set a variable for text substitution |
| text | Define some text |
| world | A group of scenes |