Launch Setup

Choose operation, mode, and settings before launch.

Step 1 of 6 • Operation

Operation

× Multiplication

Multiply the two numbers.

+ Addition

Add the two numbers together.

Rationals

Match fractions to decimals.

Squares

Perfect squares and square roots.

Mode

Digit Hunt

Shoot digits right-to-left for rapid hits.

Classic Answer

Shoot the full answer to each problem.

Series

Add multiple numbers and shoot the sum.

Stampede

Shoot wrong asteroids. Absorb the correct.

Factor Hunt

Find the missing factor to complete the product.

Divisors

Shoot every divisor of the number.

Submode

2 by 1

Two-digit by one-digit problems.

3 by 1

Three-digit by one-digit problems.

Difficulty

Easy

Slower speed, fewer decoys, more lives.

Normal

Balanced pace with standard tables.

Hard

More decoys, faster asteroids, tighter focus.

Brutal

High speed and pressure for expert runs.

Cluster Selector

Sector Run Cluster

Starter sector lanes with balanced visibility.

Rift Assault Cluster

Higher contrast lanes tuned for high-speed runs.

Void Run Cluster

250

Dark compression field with narrow visibility lanes.

Nebula Seige Cluster

450

Heavy-flare battle zone with dense hazard drift.

Apex Frontier Cluster

700

Expert frontier lanes built for max tempo pressure.

Apex Frontier Plus

1000

Apex variant with the same battlefield profile.

ET Surface Cluster

1200

Low-orbit surface sweep with harsh contrast and long sight lines.

Ship Frame

Minerals 0

Shot Type

Crimson MK-7 Synthwave Interceptor
Balanced frame with broad wings, medium hull height, and dual midrange cannons.
Flight Medium
Wings Wide
Special Twin
Thrusters Dual
Single Standard Blaster
Reliable baseline projectile with balanced speed and precision.

How To Play

Quick start for new pilots.

Flight

  • MoveW A S D / Arrow Keys
  • FireSpace / Click
  • SecondaryE
  • SpecialQ
  • DashShift
  • PauseP
  • MousepadB
  • RestartR
  • MenuM
  • Missile moduleV (when unlocked; overrides menu shot until toggled off)

Tips

Use secondary powerups to control the field when the screen gets crowded.

Your pre-launch shot type is the default primary. Press V to arm the missile module (answer prompt) or return to the menu primary. Ammo shows at the bottom right during flight.

Unlock Item

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Minerals 0
Cost 0
MENTARIS The Arith Belt

Settings console for pilots.

Audio

    Display

    Switch between fullscreen, commands, and widened layout.

    Controls

    MOVE: WASD OR ARROWS
    FIRE: SPACE OR CLICK
    SECONDARY: E
    SPECIAL: Q
    DASH: SHIFT
    PAUSE: P | MENU: M | MISSILE MODULE: V

    Note: If you have Steam, you can remap your controller to the keys used in the game and play with a controller.

    Catalogs

    Secondary Powerups

      Defense Powerups

        Offense Shot Upgrades

          Ships

            Shot Type

            Choose your starting blaster.

            Grade Level

            Select your grade to pre-fill Single Mission with the right number ranges, difficulty, and pace. You can still adjust everything manually after.

            Select a grade above to see what changes.

            About Mentaris

            The Arith Belt — math you play like an arcade.

            Mentaris: The Arith Belt is a synthwave space shooter where every wave is a math problem. Asteroids carry answers—you read the prompt in the HUD, fly your ship, and blast the rock that matches before decoys or timers beat you.

            What it is

            • Fast sessions that mix mental math with reflex and positioning.
            • Multiple operations (multiplication, addition, rationals, squares, and more) and modes (digit hunt, classic, stampede, and others).
            • Campaign runs, missions, ship roster, power-ups, and alien waves layered on top of the core loop.

            Why it exists

            • Make arithmetic practice feel like a reward loop—score, streaks, and ship upgrades—not a worksheet.
            • Give everyone a polished math arcade: quick bursts on the web or longer runs from a desktop install.
            • Coming next: Galactic leaderboards, co-op with friends, fresh missions, and a Belt arcade of themed mini games (memory, snake, minesweeper-style puzzles, and more)—all aimed at the same goal: learn math by flying it (and playing it).

            Thanks for playing Mentaris: The Arith Belt. Fly safe, stack your streaks, and stay tuned for more.

            Roadmap

            Galactic ranks, leaderboards, and what comes next for social play.

            This wave is about sharing your runs globally—cloud-backed Galactic Ranks, low-friction pilot names, and optional accounts once the boards feel great for everyone.

            Tier 3 — Galactic ranks & social

            • Global leaderboards (coming soon): cloud-backed Galactic Ranks—send your mission scores, filter by mode and operation, and see how you stack up worldwide.
            • Friendly pilot names with privacy in mind; jump in with your first ship without signing up.
            • Optional player accounts later, once the boards feel great for everyone.

            Tier 4 — Belt arcade (mini games)

            • Mini games hub: a corner of the site with short standalone games—same Mentaris look and sound, but each with its own rules and scores (optional light ties to Galactic later).
            • Matching / memory: pair tiles that link expressions to values, or belt glyphs to ship modules; decks get harder as you clear boards in a time limit.
            • Snake (belt edition): a themed snake loop—e.g. collect only the correct-answer pellets while decoys cost a life, or a classic grid snake framed as a drone threading an asteroid lane.
            • Other candidates: Simon-style recall on short digit/operator sequences; a lane sorter that swipes values into “< / = / >” buckets; rapid “which expression is larger?” duels; a calm pipeline where you fix broken equations before they reach the belt.

            Timing can shift, but this is the shape of what is ahead. Thanks for flying with us.

            Sandbox access

            Enter the master code to open the training range.

            Campaigns cleared

            You have finished every campaign. Here is your sandbox master key.

            Open Settings, tap Sandbox at the top, and enter this code to launch.

            Leaderboards

            Top scores across all sessions.

            Loading scores...
            # Pilot Score Rank Level Duration Timer Completed

            Mission Briefing

            Review your loadout before launch.

            Mission objective

            --

            Initializing launch sequence...
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            --
            --
            Mode —
            Difficulty —
            Operation —
            Submode —
            Lives —
            Strikes —
            Time limit —
            Commander Solver
            COMMANDER SOLVER
            Command Directive
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            Campaign

            Complete missions in order. Three failures end the run.

            Campaign Profiles

            Choose a profile to continue your campaign progress.

            Campaigns

              Campaign Info

              Select a campaign.
              Campaign details will appear here.

              Missions

                Details

                Select a mission to view its settings.

                Loading campaign status...

                Erase Campaign?

                Erase campaign progress for this profile?

                This wipes campaign progress and resets all missions for this pilot.

                Achievements

                0 / 67 unlocked

                Select Your Grade

                Pick your grade so the game matches your level — you can change this anytime in Settings.

                Select a grade above to continue.

                Restart Campaign?

                You already have progress. Starting over will reset it.

                Choose to restart from Mission 1 or continue from your current mission.

                Re-Deploy Mission?

                This mission is already cleared.

                No minerals will be collected for this mission because it was already cleared. You can replay it to chase a higher score. Your campaign progress will not be affected.

                Best Score: 0