There are three graphical themes available: Playground, Monster high and Neutral. These are set in the route's basic settings and they affect all of the learning units within the route.
The preview of skins in different learning unit types:
Text task (Playground, Monster high, Neutral) - all three skins are the same
Comprehension (Playground, Monster high, Neutral)
Open question (Playground, Monster high, Neutral) - all three skins look the same
Millionaire (Playground, Monster high, Neutral)
Sets (Playground, Monster high, Neutral)
Affix (Playground, Monster high, Neutral)
True or false (Playground, Monster high, Neutral)
Fish in the water (Playground, Monster high, Neutral)
Hangman (Playground, Monster high, Neutral)
Boom! (Playground, Monster high, Neutral)
Bubble monster (Playground, Monster high, Neutral)
Math monster (Playground, Monster high, Neutral)
PDF - there are no skins in this engine, it displays the uploaded PDF
Video - there are no skins in this engine, it displays the added video