4D Core Defense · Competitive · Free
Hold the core.
Across every dimension.
REDOUBT is a free 4D tower-defense game. Build a living grid of turrets, survive escalating intrusions, then ascend as the whole battlefield folds into a harder dimension. Raid rival redoubts and climb the leaderboard.
What is REDOUBT
A tower defense that never stops rising
REDOUBT is a persistent core-defense strategy game you can play free online. You start with a single core on an open grid and a fistful of compute. Every wave of intrusions forces a choice: spend on more turrets, harder walls, energy, or heat sinks. Survive long enough and the game does something most tower defense games never do.
It folds into the fourth dimension. Ascension banks your progress and reboots the battlefield into a deeper, stranger dimension with new rules, tougher enemies and richer rewards. Your permanent upgrades carry across every dimension, so each run climbs higher than the last. This is the 4D in 4D core defense: not just space, but the stack of realities you push through.
When you are ready to go on the offensive, hack a rival mainframe and raid another player's redoubt in a plan-then-command operation. Everything runs in your browser with cloud accounts, leaderboards and a live world feed. No download, no paywall, no pay-to-win.
◉ Persistent core
Your fortress and upgrades survive death. Every collapse banks Blackbox Memory toward permanent power.
◻ Folding dimensions
Ascend the 4D stack. New mutators and enemies every dimension, endless once you go deep enough.
⚔ Raid rivals
Compose squads, set standing orders, and breach another redoubt. Climb the competitive leaderboard.
FAQ
Questions, answered
Is REDOUBT free?
Yes. Free to play, no paywall, and never pay-to-win. Optional cosmetics and an operator pass support the game, but every gameplay advantage is earned.
Do I need to download it?
No. REDOUBT runs instantly in your browser with cloud saves. You can also install the native Windows app or sideload the Android build if you want.
What makes it a 4D game?
Survive long enough and the whole battlefield folds into a deeper dimension with new rules and tougher enemies. Your upgrades carry across every dimension you ascend into.
Is it competitive?
Yes. Raid other players' redoubts, climb the global leaderboard, and fight through a live, persistent world with cloud accounts.
Ready
Boot your redoubt
Free, instant, and running in the browser you already have open.
▶ PLAY REDOUBT FREE