Chthonian TD

Chthonian TD is a co-op action roguelite and tower defense game for 1–4 players. You fight escalating waves while managing defenses, then descend into a crystal mine to grow stronger. Runs last about 15 minutes, and survival depends on active decisions rather than relying on towers alone.

Fight and build

You move, aim, dodge, revive teammates and respond to threats while your defenses buy you time. Level-ups offer upgrade cards that reshape your build: some improve safety, some reward greed, and others push the run toward instability. Your choices change how each run plays, and no two runs are the same.

Risk in the mine

You can hold the line above or descend into the mine to accelerate your growth. Mining fuels stronger builds, but leaving at the wrong time can cost the run. A powerful enemy encounter changes the pace midway through a run. If you survive, you can continue into optional Endless Mode.

Roles and regions

Four roles contribute in different ways: the Fighter controls space and absorbs pressure, the Miner accelerates the economy and scaling, the Engineer stabilizes lanes and strengthens defenses, and the Medic helps prevent a collapse when mistakes happen. XP is shared, builds diverge, and survival is collective. The Abandoned Mine is the first region; surviving runs unlocks the Forgotten Ruins, Frozen Caverns and Molten Depths, each with new enemies, new pressure and a different battlefield.

Game features

• Online co-op for 1–4 players
• Runs of about 15 minutes
• Two map styles with distinct pacing
• Four regions to fight through
• A powerful mid-run enemy encounter
• Optional Endless Mode
• Card-based progression during each run
• Persistent upgrades between runs
• No friendly fire