Button Combo Lock Puzzle

Button Combo Lock

A press-the-buttons-in-order puzzle. Correct sequence fires a trigger; any wrong press resets progress.

Original, compile-verified Verse by Bizanator (Biloxi Studios). Clean-room sample you can drop into a UEFN project and adapt.

# Button Combo Lock — Biloxi Studios Inc.
#
# A "press the buttons in the right order" puzzle. Players press a set of buttons;
# if they enter the correct sequence, a trigger fires (open a door, spawn loot,
# etc.). Any wrong press resets their progress. Each button knows its own id via a
# small per-button handler object.
#
# Teaches: per-button handler objects carrying state, tracking ordered progress in
# a single index, comparing against a configurable solution, resetting on error,
# and firing a trigger on success.
#
# Setup:
#   * Buttons holds the button_device(s).
#   * Solution lists the button INDICES (into Buttons) in the required press order,
#     e.g. array{2, 0, 1} means "press button 2, then 0, then 1".

using { /Fortnite.com/Devices }
using { /Verse.org/Simulation }
using { /UnrealEngine.com/Temporary/Diagnostics }

log_button_combo_lock := class(log_channel){}

# One per button; remembers which button index it represents.
combo_button_handler := class():
    ButtonId : int
    Lock : button_combo_lock

    OnPressed(Player : agent) : void =
        Lock.OnButtonPressed(ButtonId)

button_combo_lock := class<concrete>(creative_device):

    Logger : log = log{Channel := log_button_combo_lock}

    @editable
    Buttons : []button_device = array{}

    # The required press order, as indices into Buttons.
    @editable
    Solution : []int = array{0, 1, 2}

    # Fired once the full solution is entered correctly.
    @editable
    SolvedTrigger : trigger_device = trigger_device{}

    # How many correct presses the players have entered so far.
    var Progress : int = 0

    # True once solved, so further presses are ignored.
    var Solved : logic = false

    OnBegin<override>()<suspends> : void =
        for (Index -> Button : Buttons):
            Handler := combo_button_handler{ButtonId := Index, Lock := Self}
            Button.InteractedWithEvent.Subscribe(Handler.OnPressed)

    # Called by a button handler when its button is pressed.
    OnButtonPressed(ButtonId : int) : void =
        if (Solved?):
            return
        if (Expected := Solution[Progress], Expected = ButtonId):
            # Correct next press.
            set Progress += 1
            Logger.Print("Correct press {Progress}/{Solution.Length}.")
            if (Progress >= Solution.Length):
                OnSolved()
        else:
            # Wrong press — start over.
            if (Progress > 0):
                Logger.Print("Wrong press — combo reset.")
            set Progress = 0

    OnSolved<private>() : void =
        set Solved = true
        Logger.Print("Combo lock solved!")
        SolvedTrigger.Trigger()

Button Combo Lock Puzzle

Button Combo Lock

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