"Simple sample", Philipp Lenssen

start
    ---
        There's a treasure chest here, and
        a door leads to the north.

    --> open chest ? ![chest open]
        Open the treasure chest

    --> northern room
        Leave the room

open chest
    ---
        You open the chest and take two
        silver coins.

    _ chest open
    % silver = [silver] + 2
    $ test = hello world

    <--
        Continue

northern room
    ---
        The path leads north.
        You walk a bit, get tired, go to
        sleep & dream about your [silver] silver coins.
        *The End*

<station id="armwrestle try champ">
    <comment>
        Choices are randomized so the peanuts solution won't stick
        out on a second wrestling if the player collected them by
        then.
    </comment>

    <if check="{random 0, 100} greater 50">
        <text>
            You chose one strong monkey to quarrel.
            Your swollen red arm is uncomfortably close to the table by now
        </text>
        <choice station="armwrestle kick chimp">Kick the chimps foot under the table</choice>
        <choice station="armwrestle blow air">Blow some air in his face</choice>
        <choice station="armwrestle throw peanuts" check="[has peanuts]">Throw a peanut with your left hand</choice>
    </if>
    <else>
        <text>
            You chose one strong monkey to quarrel.
            Your swollen red arm is uncomfortably close to the table by now
        </text>
        <choice station="armwrestle tell joke">Tell a joke</choice>
        <choice station="armwrestle throw peanuts" check="[has peanuts]">Throw a peanut with your left hand</choice>
        <choice station="armwrestle concentrate">Concentrate and try harder</choice>
    </else>
</station>