@startuml
!define DARKGREEN
!include https://raw.githubusercontent.com/Drakemor/RedDress-PlantUML/master/style.puml 

left to right direction
skinparam packageStyle rectangle
actor user
actor teacher
rectangle game {
    user -- (answer)
    (question) <. (game)
    (feedback) <. (answer)
    (answer) <. (question)
    (feedback) -- teacher
}

@enduml