Wheat Awn: Line Zero is a single-player military-management game with turn-based card battles. A new campaign begins with two playable lessons. In battle, select a living enemy platoon, choose an officer and use one of that officer's available tactical cards; after your order resolves, the enemy takes its turn. In the Live-Fire Trial, move with WASD or the arrow keys and survive until the timer ends.

Go to the police station in Wheat Awn Town and speak to the Police Chief. Choose how long the trial will last, then dodge ricocheting boulders and machine-gun sweeps. Star Coins are added to the run every five seconds. Finish the timer to keep all of them. Death or early withdrawal erases only that run's earnings; coins owned before entering remain safe.

Use Star Coins in town to register each new group of 30 soldiers and form another platoon. Buy enough weapons for every soldier you deploy, together with medicine and special supplies. At the Academy, spend Star Coins to select officers. An officer can enter only courses matching their military attributes. Academy simulations provide both armies and their supplies, so they do not consume your inventory. Win a course and choose one of three tactical cards for that officer's field plan.

Return to the military compound, prepare your platoons and board the train. Every operation lists the required position, number of platoons and equipment before deployment. In battle, a tactical card works only when the deployed force contains the troops and equipment printed on it: infantry orders need armed infantry, armored orders need tanks, rocket orders need launchers, air orders need aircraft, and medical orders consume medicine. The Agent Radio reveals the enemy's next order and its effect, giving you a chance to prepare a counter.

The first nine warzones award promotions as your force grows from one 30-soldier platoon toward 729 platoons. Six final challenge warzones then test the army you built. Clear all 15 to finish the campaign; the ending records how many in-game days you needed.