Breaker:
    type: world
    debug: false
    events:

        on player steps on green_wool in:dungeon:
        - if <player.location> != <context.location>:
            - narrate "Color changed below you to yellow"
            - modifyblock <context.location> yellow_wool
            - stop
        on player steps on yellow_wool in:dungeon:
        - if <player.location> != <context.previous_location>:
            - narrate "Color below you unaffected"
            - stop