ACK24

A calculator that fights back

Four numbers. One target.
Zero mercy.

Group 1 · Level 17Target 24
6×4 

Ack24 turns the classic 24 game into a full arcade: duels with real stakes, brain-training drills, a monochrome dungeon, a handheld game cabin and a world of collectible cat art.

Watch the demo See a 1v1 duel Watch the series

Design breakdown · 5:49

From market
to every mode.

A narrated walkthrough: market positioning, the five design rules, how each mode plays, and how it is built. English voiceover, subtitles in the language you pick above.

Levels

Gameplay demo · 3:35

Every mode.
One take.

Recorded on a real phone with the game's own sound. Press play, or jump straight to a chapter.

    How it started

    Built for moments
    with no signal.

    Ack24 began with one question: what if the 24 game lived on a calculator you carry everywhere? Every feature since then answers to the same brief. Short rounds, instant restarts, and nothing that needs a network to be fun.

    1. Idea

      The 24 game on a physical calculator: keypad, LCD, one target.

    2. Core loop

      Four numbers, one answer, a clock. Restart with one tap.

    3. Rivalry

      1v1 with stakes, a card race to pick the game, nearby play without the internet.

    4. Worlds

      A monochrome dungeon, a handheld cabin and a 3D maze, each with its own rules.

    5. Polish

      36 languages, sound sets, themes and a local archive that needs no account.

    Design rules we kept

    Gameplay first

    The puzzle owns the screen. Score, player and match state sit in one compact row.

    One geometry

    Every mode reuses the same keys, spacing and touch targets of at least 44 points.

    Yellow means act

    Yellow marks the decisive key or the active state, never decoration.

    Readable at a glance

    LCD contrast, tabular numbers, and state shown by shape and text, not color alone.

    Levels & Endless

    Punch it in.
    Hit 24.

    The whole game runs on a real calculator keypad. Combine four numbers with + − × ÷, brackets, powers and roots until the LCD lands on exactly 24.

    • Levels climb group by group, with Skip and Answer when you are stuck.
    • Endless keeps dealing fresh hands and tracks your best streak.
    • Fix 24 hands you a broken expression to repair.
    Levels
    Endless

    Arena · 1v1

    Bet your points.
    Race for the pot.

    Find a rival online, nearby over Wi-Fi or Bluetooth, or by room code. Stake your points, watch the cards race to pick the game, then solve faster than the other side.

    +10+50+100+500
    1

    Stake

    Ten seconds to set your wager. Both players see the pot grow.

    2

    Race

    Game cards race across the board. The winner decides what you play.

    3

    Duel

    Same puzzles, same clock. First to clear takes the pot; quitters forfeit their stake.

    Multiplayer · Ranked & Tournament

    Up to 32 players.
    One ladder.

    Rooms hold 3 to 32 players. Ten or fewer play a straight ranked match; bigger rooms become a tournament that filters the field round by round until the last players fight for rank. Every round you survive, the points on the line multiply.

    Ranked · up to 10

    Everyone plays the same five levels. Finish order decides the split: first place takes the biggest share of the pot.

    Tournament · 11 to 32

    Random teams, a drawn win target and several elimination rounds. Survivors carry their winnings forward and the stake doubles each round, until the finalists play for rank.

    1

    Ranked draw

    The room locks a level tier, then the rules for the round are drawn.

    2

    Team draw

    Players split into two teams at random and a win target is drawn. First team to reach it wins.

    3

    Live race

    Both teams' progress ticks live above the keypad while you solve.

    Play your way

    Touch. Keys.
    Gamepad.

    Ack24 runs on phones, tablets and Mac. Use whatever is in your hands; the game shows the right hints for the device you are holding.

    Touch

    Tap the calculator keys. In Pixel Cabin, pick a cross pad, round pad or joystick and resize every button.

    Keyboard

    Type digits and operators straight in, with shortcut badges on screen. In Pixel Cabin, bind any key to any button.

    Gamepad

    Connect a controller and play. Standard presets or your own plan, with turbo A and B in Pixel Cabin.

    Brain gym

    Sharpen
    every sense.

    Short, savage drills between duels. Each one is timed, scored and saved to your record.

    • Number Grid · tap the numbers in order, from 3×3 up to 5×5.
    • 100 Maze, Ice Faces, Spin 100 · hunt the target hidden in a crowded field.
    • Four Fours · build any target from −1000 to 1000 using only four 4s.
    Number Grid
    Mind mazes

    Original game · Magic 4

    Four 4s.
    Any number.

    Target 24
    Magic 4

    Dungeon · Shadow Vortex

    Step into
    the vortex.

    A second world drained of color, run by a hooded cat crew and a countdown clock. Four trials test timing, memory, logic and spatial sense.

    Key & vortex home
    Eagle Eye
    Time Master
    Memory Match
    Mirror Grid
    Sliding Puzzle

    Trial · Stone Tracking

    Keep your eye
    on the white stones.

    Token Tracking · gameplay

    Replica B · Pixel Cabin

    A handheld
    inside your phone.

    Flip to a full game-console layout with a D-pad and ABXY buttons. Pick a block theme and a soundtrack, then drop into Gemfall or clear stacks of cat tiles.

    • Gemfall · falling-block rounds with themed sets like Cat Paradise.
    • Tile match · clear three of a kind before the tray fills.
    • Your controls · cross, round or joystick pads, custom layouts, 2-player link.
    Gemfall
    Tile match
    Setup

    Replica B · Handheld modes

    Seven formats.
    Every control.

    Pixel Cabin reads game files in seven handheld and console formats and dresses the screen to match. Then it lets you play them your way.

    FCGBGBCGBANGPNGPCArcade
    Shells & finishesShell materials, LCD backdrops and 10 button finish sets.
    Touch padsCross, round or joystick, with overall scale and button size.
    Gamepad & keyboardStandard presets or a custom plan; bind every key.
    Turbo & extrasTurbo A and B, Select, Start and pause on any button.
    Portrait or landscapeRotate to a wide screen with side controls.
    Two players, no internetPair over Wi-Fi or hotspot; the host sends the game to the guest.
    Controls
    2P online

    Replica B · Screens

    Every console.
    True pixels.

    Pixel Cabin draws each format at its native resolution, from the FC's 256 × 240 frame to the GBA's wide 240 × 160 screen. Tap a format to see the screen change. The console below is drawn entirely in code.

    Twelve shells

    Real screens from the game: pick a shell material, then an LCD backdrop and one of 10 button finishes.

    Clear shell
    Deep Lattice
    Gilt Grid
    Mist White
    Sky Lattice
    Moss Green
    Face Blocks

    Offline first

    No signal.
    Still playing.

    Ack24 is made for the subway, the flight and the long queue. Everything you need lives on the device, and every round is short enough to finish before your stop.

    SubwayFlightQueue
    • Local archive · progress and points are saved on the device; no account required.
    • Nearby duels · play 1v1 over Wi-Fi, hotspot or Bluetooth, with no internet.
    • Built to last · Endless 24, all 2,001 Four Fours targets, daily cards and a dungeon that resets.
    • Pick up, put down · rounds take a minute or two and resume where you left off.

    Cat Maze

    Get lost.
    On purpose.

    Dive from a towering 3D labyrinth into hand-drawn mazes, then steer out against the clock. Spend 300 points to unlock it for 12 hours.

    Cat Maze

    Collect the world

    Every win
    pays in art.

    Daily travel cards take you to a new world table, from a pastrami sandwich to a snowy shrine. Points unlock painted cat wallpapers: 412 for phones and 218 for tablets and desktop.

    Cards & wallpapers
    Home themes

    Climb the board

    Your name.
    Top three.

    Rank globally, by region or among friends. Your profile card carries your player ID, avatar and nickname into every duel.

    GlobalRegionFriends
    Leaderboard
    Profile

    Wallpapers & cards

    Earn the art.
    Keep the cards.

    Items

    Sixteen tools.
    One battery.

    Points & progress

    Two scores.
    One ladder.

    Points are your wallet: you stake them, spend them on unlocks and win them back. Level points are your rank: they only go up, and every clear in every mode adds to them.

    Lv3Battle tier 1
    16.3125 / 40 P23.6875 P to Lv4
    Valid level pts56
    Lifetime level pts66

    Example from the demo account. Every 40 level points is one level, and spending never lowers it.

    How you earn level points

    Store & ledger

    Point packs

    Top up in one tap. Bigger packs add bonus points and gift shards, up to 38% off the list price.

    • Redeem code · enter an 8-digit point code to add points instantly.
    • Ledger · every entry, stake and daily total, grouped by day, week or month.
    • Conversion · move points between the main world and the dungeon.

    Prices shown are from the China mainland build (CNY) and may differ in your region.

    Ready?

    Make
    24.

    On iPhone and Android, in 36 languages. Bring a friend and bring your points.

    Replay the demoBack to the arena