TEACHER SANDBOX · Separate from normal matches Teacher tools Relock Back to title Teacher tools Unlock this separate sandbox to edit units, terrain and resources. Access relocks on reload.
Back to title Close tools Teacher sandbox
Open teacher answer key ↗
Open Hold the Line teacher companion ↗
Open matching Hold the Line student field notes ↗
Run test turn Step 1/120 s Advance 1 s Reset test Undo edit Inspect trajectory
Edits affect this sandbox only. Finish or reset a running test before editing.
Prepare a scenario
Presets ScenarioStandard field Full-capacity volley Crater recovery Unlocked counterattack Horizontal carrier drop Damaged bases Simultaneous final hits Load preset Reset test repeats the starting field. Choose gravity and map size using New match.
Open lesson chooser ↗ Continue your match?
Resume saved match Start new match Download existing save
Back to title
Back to game Save / resume
The match saves after orders and round changes, during replay, and when you leave. Reload restores private planning behind a handoff; active replay restores paused.
Download save file Import a saved match An imported save replaces this session. Normal and sandbox save files are kept separate.
Save and return to title Go to orders Choose a drill Skip tutorial FIRST LIGHT ACADEMY · BATTLE SCHOOL
Record this trialEnter impact x and flight time in the orders below Use paper / observe this drill G.U.E.S.S.: G ivens → U nknowns → E quation → S ubstitute → S olve. Numerical entries concern the stationary reference cannon. A paper choice does not claim a saved numerical answer.
Hint 1 · Concept
Why did A1’s shot arrive early?Choose an explanation Terrain obstructed the predicted path Gravity changed after firing Every difference proves wrong arithmetic Check explanation
Retry this trial
Preparing local save…
SOL HEIRS
CODEX NAVIGA
Overview Zoom + Zoom − Reference Target Grid
← Camera center 2,000 m →
VIOLET EXPANSE · 4 KM BATTLEFIELD
Orders sealed
Keep the previous player’s orders private. The battlefield has not advanced.
Preparing the battlefield artwork…
Tap terrain to mark a target. Drag to pan. g = 2.0 m/s² · No air resistance
CARRIER / HORIZONTAL DROP
Stationary artillery shares one firing solution. Orders stay private until both players commit.
Move cannons
Cannon movement Choose Fire or Move for each cannon. Move any number; every moving cannon holds fire. Each has a 10 s movement window and a requested route of up to 150 m.
Winches engage automatically on steep terrain. Preview uses current terrain; obstacles and incoming explosions can shorten the route.
Defensive battery One fixed battery may fire in addition to your mobile volley. Assistance never changes the submitted shot.
Battery Nuclear counterattack
Calculation reference vx = v cos(θ)
vy = v sin(θ)
Δx = vx t
Δy = vy t − ½gt²
Horizontal release: vy₀ = 0
t = √(2h/g) for a flat landing
R = v² sin(2θ)/g only at
equal launch and landing heights.
Use actual muzzle height. x increases to the right; y increases upward. Launch Angle is measured above horizontal, independent of terrain slope.
Both players committed
Let the plans collide. Both volleys, movement orders and support actions resolve on the same clock.
Watch turn play out Simultaneous resolution
Orders in motion Shots stay active after their launcher is destroyed. Excavation can change a movement route.
Replay speed1× 2× 4× 8× 16× Pause Finish turn
After-action report
Inspect new launch heights and nuclear unlocks before planning again.
Plan next round Replay last impact · analysis overlay Stop impact replay Download match data Mission log & turn events Close Skip tutorial FIRST LIGHT ACADEMY
Battle field guide
Destroy the opposing 5 HP base. Player A locks private orders, then passes the device to Player B. Both volleys and movement orders resolve together.
Plan a shot Choose a reference cannon and target. Use the displayed muzzle coordinates, speed and angle. Stationary cannons share the firing solution; a cannon ordered to move holds fire. Friendly fire applies. The grid and calculation view help measure the field.
The three-round carrier cycle Deploy: add one artillery piece, up to 5 active cannons. At capacity, hold the reinforcement.Ordnance: release a horizontal projectile. Initial vertical velocity is zero; horizontal velocity is the carrier’s ±16 m/s.Service: fly back to the home pad, land, refuel and restock.The schedule repeats on round 4. A destroyed carrier returns three rounds later, with the same global schedule. Payloads already released continue.
Landing safely on your own half Terrain remains destructible, including the deployment area. Allowed release positions include the worst fall to bedrock plus rebound and skid. The landing cradle activates visible braking jets at first contact; braking continues through rebounds until the cannon comes to rest. This is a powered game mechanic, separate from the ideal projectile calculation before contact.
Movement, craters and counterattacks Choose Fire or Move for each cannon. Any number may move instead of firing. Each requested route is up to 150 m within 10 seconds; the winch automatically handles steep slopes at a slower speed. Obstacles, craters and the time limit can shorten a route. A surviving base unlocks one nuclear round once per match at 2 HP or less, available next round. Nuclear blasts damage friends and enemies.
Reading the result Payload flight time begins at release. Time until release is displayed separately. Compare your optional prediction with the reference cannon’s impact in the debrief. Replay speed changes playback, never physics. Map axes and artwork are scaled for readability; displayed coordinates are authoritative.
Open the printable Academy manual ↗
Open printable battle-school companion ↗
Matches save on this device. Resume restores private plans behind a handoff and pauses any active replay. Teacher Tools opens a password-protected sandbox with separate storage.
Choose a battle drill Open any drill in any order. It starts a fresh practice setup. Your first entries and completed drills stay recorded.
Open printable battle-school companion ↗
Drill Open drill Keep this trial Download practice record Skip tutorial Carrier drill complete.
Normal matches use all four gravity worlds, save locally and offer separate password-protected teacher tools.
Return to drills Back to Academy Start a normal battle Skip tutorial Start a new match? This resets terrain, damage, ammunition and current orders.
BattlefieldMoon · 1.6 m/s² Violet Expanse · 2.0 m/s² Mars · 3.7 m/s² Earth · 9.8 m/s² Map sizeSmall · start 1 / maximum 3 Medium · start 2 / maximum 5 Large · start 3 / maximum 5
Start new match Keep playing
Close Skip tutorial Presentation & sound On automatically for touch screens. Use applies your entry; Cancel keeps the old value. A physical keyboard also works.
Replay & sound settings
Sound on Music volume Effects volume
Audio starts on your first tap or keypress. Mute it here at any time. Slow motion changes playback, never the physics clock.
CODEX NAVIGA
