An idle siege defense
Every night the dead march on the last wall. You hold it.
Closed test now Free demo in October 2026
Marrow March is a free incremental tower defense game that runs in your desktop web browser: you raise an army to hold the last wall against a skeleton horde, grow it through hundreds of upgrades, and climb ten ages of the dead.
A tower defense where the towers are soldiers you place and train, a wall you repair and raise, and an incremental game where every loss still pays into the next attempt. Single-player, and no account needed.
How it plays
Place archers, wizards, catapults, shamans, windcallers and ballistas on the field before the wall. Each soldier levels up and learns skills of its own, and one strong archer beats three weak ones.
The dead come in assaults: skeletons, hounds, archers, shield bearers and necromancers who raise the fallen. Traps on the field and guns on the wall thin them before they reach your line.
When the wall is breached the fight moves inside, onto the road to the city gate. Drop the portcullis, pour the oil, raise the drawbridge and, in time, open the sea gates on them.
Gold buys soldiers and their upgrades within a run. Essence, earned every assault and kept when you fall, grows the Essence Tree: 351 upgrades across 6 disciplines, revealed as you buy.
Each age is 20 assaults on the March, from The Barrow Night to The Last Siege, under fog, snow and storm, with lords of the dead among them: Bone Colossus, Grave Warden, Ossuary King, Bone Titan.
From commander level 6, assaults can run on their own. And when a line of commanders ends, its Legacy lights the Ancestral Sky, and the next line climbs the same ages faster.
The beginner's guide The wiki What is incremental tower defense?
The story
Every night the dead march on the last wall. You are its commander. When you fall, you join the Ancestral Sky, and the next of your line holds the wall stronger for it. Ten ages. One wall. The Marrow March does not stop.
Ten ages, each with its own sky, its own host of the dead and a lord waiting at its end.
From the devlog
What Marrow March is, why the fight moves to the road when the wall falls, and how to join the closed test.
Marrow March is a free incremental tower defense game that runs in your desktop web browser: you raise an army to hold the last wall against a skeleton horde, grow it through hundreds of upgrades, and climb ten ages of the dead.
Yes. Marrow March is free to play in the browser. Right now it is in an invite-only closed test; the free demo opens to everyone in October 2026.
No. Marrow March runs in a desktop web browser such as Chrome, Edge, Firefox or Safari. There is no account and no install; your progress is saved in that browser, in three save slots.
Not yet. Marrow March is built for a desktop browser with a mouse and keyboard, and there are no touch controls in the game.
Partly. It is an incremental tower defense: you place and upgrade your army yourself, and from commander level 6 you can let assaults run on their own. Progress compounds through the Essence Tree and a prestige layer, the Ancestral Sky.
Long. The March has 10 ages of 20 assaults each (200 in all), the commander's ladder runs to level 100, and the Essence Tree holds 351 upgrades. Clearing every age takes many hours of play.
Early on, a fallen wall ends the run, but the Essence you earned is kept. Once the first age is cleared, a breach no longer ends it: the fight moves inside, onto the road to the city gate, where your soldiers, the portcullis and the gatehouse engines make a last stand.
Write to marrowmarch@gmail.com and ask for the password. The closed test runs at play.marrowmarch.com.
Enes, an independent solo game developer.