Play free

Codex

World and floors

A run is a descent. Every floor has a portal sealed by its boss: summon the boss when your build is ready — wait too long and the Endless Swarm begins.

the forest floors

The Thornwood

A stone bridge leading through a dark forest to a keep

The run begins under old trees where the forest has turned on its keepers. Roots, spores and bark-clad guards fill the first floors.

the ruined city

The ruined city

A ruined cloister with a well, lit by the setting sun

Below the forest lies a city that forgot how to die: hollow courtiers, bell towers and chain-bound wardens in crumbling halls.

the burning march

The burning march

A gothic sanctuary gate glowing with firelight

The deepest floors burn. An ash legion marches through furnaces and cinder fields toward the heart of stone at the bottom.

Descending

How floors work

Every floor starts on a plaza with the Wishing Well, the Thorn Archive and the Hall of Fame. Out in the wilds you fight the horde, open chests, charge Thorn Sigils and face minibosses. The portal is sealed by the floor’s portal boss; beat it to descend, where the monsters hit harder and the rewards grow.

Ready for the horde?

Free, instant, no download — on desktop and mobile.

Play free in your browser
▶ Play free in your browser